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100(x-5)=-80
We move all terms to the left:
100(x-5)-(-80)=0
We add all the numbers together, and all the variables
100(x-5)+80=0
We multiply parentheses
100x-500+80=0
We add all the numbers together, and all the variables
100x-420=0
We move all terms containing x to the left, all other terms to the right
100x=420
x=420/100
x=4+1/5
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