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8x+3=3x+18=
We move all terms to the left:
8x+3-(3x+18)=0
We get rid of parentheses
8x-3x-18+3=0
We add all the numbers together, and all the variables
5x-15=0
We move all terms containing x to the left, all other terms to the right
5x=15
x=15/5
x=3
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