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X+(4X-5)=90
We move all terms to the left:
X+(4X-5)-(90)=0
We get rid of parentheses
X+4X-5-90=0
We add all the numbers together, and all the variables
5X-95=0
We move all terms containing X to the left, all other terms to the right
5X=95
X=95/5
X=19
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