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12-6x=-3x-3
We move all terms to the left:
12-6x-(-3x-3)=0
We get rid of parentheses
-6x+3x+3+12=0
We add all the numbers together, and all the variables
-3x+15=0
We move all terms containing x to the left, all other terms to the right
-3x=-15
x=-15/-3
x=+5
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