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5b+143+149+8b-50+3b+50+7b-35+123+3b+50=1080
We move all terms to the left:
5b+143+149+8b-50+3b+50+7b-35+123+3b+50-(1080)=0
We add all the numbers together, and all the variables
26b-650=0
We move all terms containing b to the left, all other terms to the right
26b=650
b=650/26
b=25
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