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3(-5b+7)+5b=-19
We move all terms to the left:
3(-5b+7)+5b-(-19)=0
We add all the numbers together, and all the variables
5b+3(-5b+7)+19=0
We multiply parentheses
5b-15b+21+19=0
We add all the numbers together, and all the variables
-10b+40=0
We move all terms containing b to the left, all other terms to the right
-10b=-40
b=-40/-10
b=+4
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