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4x-18=x-3x
We move all terms to the left:
4x-18-(x-3x)=0
We add all the numbers together, and all the variables
4x-(-2x)-18=0
We get rid of parentheses
4x+2x-18=0
We add all the numbers together, and all the variables
6x-18=0
We move all terms containing x to the left, all other terms to the right
6x=18
x=18/6
x=3
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