7(a-1)-15=-57

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Solution for 7(a-1)-15=-57 equation: 



7(a-1)-15=-57

We move all terms to the left:

7(a-1)-15-(-57)=0

We add all the numbers together, and all the variables

7(a-1)+42=0

We multiply parentheses

7a-7+42=0

We add all the numbers together, and all the variables

7a+35=0

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

7a=-35

a=-35/7

a=-5

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