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144=4x-x
We move all terms to the left:
144-(4x-x)=0
We add all the numbers together, and all the variables
-(+3x)+144=0
We get rid of parentheses
-3x+144=0
We move all terms containing x to the left, all other terms to the right
-3x=-144
x=-144/-3
x=+48
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