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