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X+(X*4)=126
We move all terms to the left:
X+(X*4)-(126)=0
We add all the numbers together, and all the variables
X+(+X*4)-126=0
We get rid of parentheses
X+X*4-126=0
Wy multiply elements
X+4X-126=0
We add all the numbers together, and all the variables
5X-126=0
We move all terms containing X to the left, all other terms to the right
5X=126
X=126/5
X=25+1/5
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