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7. -11+x=5x+3-2x 8. -3(3-3r)=-81 9. -n-3n=12 10. -2b+1+7=6

Pergunta

7. -11+x=5x+3-2x
8. -3(3-3r)=-81
9. -n-3n=12
10. -2b+1+7=6

7. -11+x=5x+3-2x 8. -3(3-3r)=-81 9. -n-3n=12 10. -2b+1+7=6

Solução

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PriscilianaVeterano · Tutor por 9 anos

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7. To solve the equation $-11+x=5x+3-2x$, we first combine like terms on both sides of the equation. This gives us $-11+x=3x+3$. Next, we subtract $3x$ from both sides to get $-11-2x=3$. Finally, we add $11$ to both sides to solve for $x$, which gives us $x=-4$.<br /><br />8. To solve the equation $-3(3-3r)=-81$, we first distribute the $-3$ on the left side of the equation to get $-9+9r=-81$. Next, we add $9$ to both sides to get $9r=-72$. Finally, we divide both sides by $9$ to solve for $r$, which gives us $r=-8$.<br /><br />9. To solve the equation $-n-3n=12$, we first combine like terms on the left side of the equation to get $-4n=12$. Next, we divide both sides by $-4$ to solve for $n$, which gives us $n=-3$.<br /><br />10. To solve the equation $-2b+1+7=6$, we first combine like terms on the left side of the equation to get $-2b+8=6$. Next, we subtract $8$ from both sides to get $-2b=-2$. Finally, we divide both sides by $-2$ to solve for $b$, which gives us $b=1$.
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