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8x+18=5x+30
We move all terms to the left:
8x+18-(5x+30)=0
We get rid of parentheses
8x-5x-30+18=0
We add all the numbers together, and all the variables
3x-12=0
We move all terms containing x to the left, all other terms to the right
3x=12
x=12/3
x=4
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