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15x+12=25x-8
We move all terms to the left:
15x+12-(25x-8)=0
We get rid of parentheses
15x-25x+8+12=0
We add all the numbers together, and all the variables
-10x+20=0
We move all terms containing x to the left, all other terms to the right
-10x=-20
x=-20/-10
x=+2
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