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4x=-x+100
We move all terms to the left:
4x-(-x+100)=0
We add all the numbers together, and all the variables
4x-(-1x+100)=0
We get rid of parentheses
4x+1x-100=0
We add all the numbers together, and all the variables
5x-100=0
We move all terms containing x to the left, all other terms to the right
5x=100
x=100/5
x=20
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