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12x+3=18x+13
We move all terms to the left:
12x+3-(18x+13)=0
We get rid of parentheses
12x-18x-13+3=0
We add all the numbers together, and all the variables
-6x-10=0
We move all terms containing x to the left, all other terms to the right
-6x=10
x=10/-6
x=-1+2/3
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