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(x+6)-(6x+7)-3x=-9
We move all terms to the left:
(x+6)-(6x+7)-3x-(-9)=0
We add all the numbers together, and all the variables
-3x+(x+6)-(6x+7)+9=0
We get rid of parentheses
-3x+x-6x+6-7+9=0
We add all the numbers together, and all the variables
-8x+8=0
We move all terms containing x to the left, all other terms to the right
-8x=-8
x=-8/-8
x=1
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