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4x+3+5x=6x-12
We move all terms to the left:
4x+3+5x-(6x-12)=0
We add all the numbers together, and all the variables
9x-(6x-12)+3=0
We get rid of parentheses
9x-6x+12+3=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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