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12=3+2x+3x
We move all terms to the left:
12-(3+2x+3x)=0
We add all the numbers together, and all the variables
-(5x+3)+12=0
We get rid of parentheses
-5x-3+12=0
We add all the numbers together, and all the variables
-5x+9=0
We move all terms containing x to the left, all other terms to the right
-5x=-9
x=-9/-5
x=1+4/5
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