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12x+10=-9x+8x+13
We move all terms to the left:
12x+10-(-9x+8x+13)=0
We add all the numbers together, and all the variables
12x-(-1x+13)+10=0
We get rid of parentheses
12x+1x-13+10=0
We add all the numbers together, and all the variables
13x-3=0
We move all terms containing x to the left, all other terms to the right
13x=3
x=3/13
x=3/13
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