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150=-40x+100
We move all terms to the left:
150-(-40x+100)=0
We get rid of parentheses
40x-100+150=0
We add all the numbers together, and all the variables
40x+50=0
We move all terms containing x to the left, all other terms to the right
40x=-50
x=-50/40
x=-1+1/4
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