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5x+42=9x+18
We move all terms to the left:
5x+42-(9x+18)=0
We get rid of parentheses
5x-9x-18+42=0
We add all the numbers together, and all the variables
-4x+24=0
We move all terms containing x to the left, all other terms to the right
-4x=-24
x=-24/-4
x=+6
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