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-6x+9=126+7x
We move all terms to the left:
-6x+9-(126+7x)=0
We add all the numbers together, and all the variables
-6x-(7x+126)+9=0
We get rid of parentheses
-6x-7x-126+9=0
We add all the numbers together, and all the variables
-13x-117=0
We move all terms containing x to the left, all other terms to the right
-13x=117
x=117/-13
x=-9
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