-5a+2(a-1)=7

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Solution for -5a+2(a-1)=7 equation: 



-5a+2(a-1)=7

We move all terms to the left:

-5a+2(a-1)-(7)=0

We multiply parentheses

-5a+2a-2-7=0

We add all the numbers together, and all the variables

-3a-9=0

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

-3a=9

a=9/-3

a=-3

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