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8x+10+2x=12x+9
We move all terms to the left:
8x+10+2x-(12x+9)=0
We add all the numbers together, and all the variables
10x-(12x+9)+10=0
We get rid of parentheses
10x-12x-9+10=0
We add all the numbers together, and all the variables
-2x+1=0
We move all terms containing x to the left, all other terms to the right
-2x=-1
x=-1/-2
x=1/2
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