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12x+36=12x-30+7x
We move all terms to the left:
12x+36-(12x-30+7x)=0
We add all the numbers together, and all the variables
12x-(19x-30)+36=0
We get rid of parentheses
12x-19x+30+36=0
We add all the numbers together, and all the variables
-7x+66=0
We move all terms containing x to the left, all other terms to the right
-7x=-66
x=-66/-7
x=9+3/7
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