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12x-(6x+3)=8x.9
We move all terms to the left:
12x-(6x+3)-(8x.9)=0
We add all the numbers together, and all the variables
12x-(6x+3)-(+8x.9)=0
We get rid of parentheses
12x-6x-8x.9-3=0
We add all the numbers together, and all the variables
6x-8x.9-3=0
We move all terms containing x to the left, all other terms to the right
6x-8x.9=3
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