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4x+12=6x+3
We move all terms to the left:
4x+12-(6x+3)=0
We get rid of parentheses
4x-6x-3+12=0
We add all the numbers together, and all the variables
-2x+9=0
We move all terms containing x to the left, all other terms to the right
-2x=-9
x=-9/-2
x=4+1/2
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