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4+x=18-3x
We move all terms to the left:
4+x-(18-3x)=0
We add all the numbers together, and all the variables
x-(-3x+18)+4=0
We get rid of parentheses
x+3x-18+4=0
We add all the numbers together, and all the variables
4x-14=0
We move all terms containing x to the left, all other terms to the right
4x=14
x=14/4
x=3+1/2
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