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