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12x+4=18-x
We move all terms to the left:
12x+4-(18-x)=0
We add all the numbers together, and all the variables
12x-(-1x+18)+4=0
We get rid of parentheses
12x+1x-18+4=0
We add all the numbers together, and all the variables
13x-14=0
We move all terms containing x to the left, all other terms to the right
13x=14
x=14/13
x=1+1/13
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