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10(8000-b)+20b=124.000
We move all terms to the left:
10(8000-b)+20b-(124.000)=0
We add all the numbers together, and all the variables
10(-1b+8000)+20b-124=0
We add all the numbers together, and all the variables
20b+10(-1b+8000)-124=0
We multiply parentheses
20b-10b+80000-124=0
We add all the numbers together, and all the variables
10b+79876=0
We move all terms containing b to the left, all other terms to the right
10b=-79876
b=-79876/10
b=-7987+3/5
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