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X+(3X-5)=143
We move all terms to the left:
X+(3X-5)-(143)=0
We get rid of parentheses
X+3X-5-143=0
We add all the numbers together, and all the variables
4X-148=0
We move all terms containing X to the left, all other terms to the right
4X=148
X=148/4
X=37
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