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-210+12x=9-6x
We move all terms to the left:
-210+12x-(9-6x)=0
We add all the numbers together, and all the variables
12x-(-6x+9)-210=0
We get rid of parentheses
12x+6x-9-210=0
We add all the numbers together, and all the variables
18x-219=0
We move all terms containing x to the left, all other terms to the right
18x=219
x=219/18
x=12+1/6
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