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12x+7x-18=2+7+10x
We move all terms to the left:
12x+7x-18-(2+7+10x)=0
We add all the numbers together, and all the variables
12x+7x-(10x+9)-18=0
We add all the numbers together, and all the variables
19x-(10x+9)-18=0
We get rid of parentheses
19x-10x-9-18=0
We add all the numbers together, and all the variables
9x-27=0
We move all terms containing x to the left, all other terms to the right
9x=27
x=27/9
x=3
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