138=-6(5-7b)

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Solution for 138=-6(5-7b) equation:


138=-6(5-7b)

We simplify the equation to the form, which is simple to understand 
138=-6(5-7b)

Reorder the terms in parentheses
138=+(-30+42b)

Remove unnecessary parentheses
+138=-30+42b

We move all terms containing b to the left and all other terms to the right. 
-42b=-30-138

We simplify left and right side of the equation. 
-42b=-168

We divide both sides of the equation by -042 to get b. 
b=4

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