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135=x+3x
We move all terms to the left:
135-(x+3x)=0
We add all the numbers together, and all the variables
-(+4x)+135=0
We get rid of parentheses
-4x+135=0
We move all terms containing x to the left, all other terms to the right
-4x=-135
x=-135/-4
x=33+3/4
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