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15x-(x-4)=18
We move all terms to the left:
15x-(x-4)-(18)=0
We get rid of parentheses
15x-x+4-18=0
We add all the numbers together, and all the variables
14x-14=0
We move all terms containing x to the left, all other terms to the right
14x=14
x=14/14
x=1
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