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x+3x=18+12-2
We move all terms to the left:
x+3x-(18+12-2)=0
We add all the numbers together, and all the variables
x+3x-28=0
We add all the numbers together, and all the variables
4x-28=0
We move all terms containing x to the left, all other terms to the right
4x=28
x=28/4
x=7
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