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8x+3=x-2x-6
We move all terms to the left:
8x+3-(x-2x-6)=0
We add all the numbers together, and all the variables
8x-(-1x-6)+3=0
We get rid of parentheses
8x+1x+6+3=0
We add all the numbers together, and all the variables
9x+9=0
We move all terms containing x to the left, all other terms to the right
9x=-9
x=-9/9
x=-1
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