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X-99=1-4X
We move all terms to the left:
X-99-(1-4X)=0
We add all the numbers together, and all the variables
X-(-4X+1)-99=0
We get rid of parentheses
X+4X-1-99=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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