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6x+9=-7x-134
We move all terms to the left:
6x+9-(-7x-134)=0
We get rid of parentheses
6x+7x+134+9=0
We add all the numbers together, and all the variables
13x+143=0
We move all terms containing x to the left, all other terms to the right
13x=-143
x=-143/13
x=-11
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