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(X-10)+4X-10)=90
We move all terms to the left:
(X-10)+4X-10)-(90)=0
We add all the numbers together, and all the variables
4X+(X-10)=0
We get rid of parentheses
4X+X-10=0
We add all the numbers together, and all the variables
5X-10=0
We move all terms containing X to the left, all other terms to the right
5X=10
X=10/5
X=2
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