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5(1+7b)=215
We move all terms to the left:
5(1+7b)-(215)=0
We add all the numbers together, and all the variables
5(7b+1)-215=0
We multiply parentheses
35b+5-215=0
We add all the numbers together, and all the variables
35b-210=0
We move all terms containing b to the left, all other terms to the right
35b=210
b=210/35
b=6
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