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7(4+b)=28+
We move all terms to the left:
7(4+b)-(28+)=0
We add all the numbers together, and all the variables
7(b+4)-0=0
We add all the numbers together, and all the variables
7(b+4)=0
We multiply parentheses
7b+28=0
We move all terms containing b to the left, all other terms to the right
7b=-28
b=-28/7
b=-4
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