7(a+8)+3(a+7)=-3

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Solution for 7(a+8)+3(a+7)=-3 equation: 



7(a+8)+3(a+7)=-3

We move all terms to the left:

7(a+8)+3(a+7)-(-3)=0

We add all the numbers together, and all the variables

7(a+8)+3(a+7)+3=0

We multiply parentheses

7a+3a+56+21+3=0

We add all the numbers together, and all the variables

10a+80=0

We move all terms containing a to the left, all other terms to the right

10a=-80

a=-80/10

a=-8

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