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X+(3X+10)=190
We move all terms to the left:
X+(3X+10)-(190)=0
We get rid of parentheses
X+3X+10-190=0
We add all the numbers together, and all the variables
4X-180=0
We move all terms containing X to the left, all other terms to the right
4X=180
X=180/4
X=45
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