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9x-142=4x+218
We move all terms to the left:
9x-142-(4x+218)=0
We get rid of parentheses
9x-4x-218-142=0
We add all the numbers together, and all the variables
5x-360=0
We move all terms containing x to the left, all other terms to the right
5x=360
x=360/5
x=72
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