158=6(1-2a)-7a

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Solution for 158=6(1-2a)-7a equation: 



158=6(1-2a)-7a

We move all terms to the left:

158-(6(1-2a)-7a)=0

We add all the numbers together, and all the variables

-(6(-2a+1)-7a)+158=0



We calculate terms in parentheses: -(6(-2a+1)-7a), so:

6(-2a+1)-7a

We add all the numbers together, and all the variables

-7a+6(-2a+1)

We multiply parentheses

-7a-12a+6

We add all the numbers together, and all the variables

-19a+6

Back to the equation:

-(-19a+6)



We get rid of parentheses

19a-6+158=0

We add all the numbers together, and all the variables

19a+152=0

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

19a=-152

a=-152/19

a=-8

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