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12=20x-3+3x
We move all terms to the left:
12-(20x-3+3x)=0
We add all the numbers together, and all the variables
-(23x-3)+12=0
We get rid of parentheses
-23x+3+12=0
We add all the numbers together, and all the variables
-23x+15=0
We move all terms containing x to the left, all other terms to the right
-23x=-15
x=-15/-23
x=15/23
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