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-6x+(x+7)=18
We move all terms to the left:
-6x+(x+7)-(18)=0
We get rid of parentheses
-6x+x+7-18=0
We add all the numbers together, and all the variables
-5x-11=0
We move all terms containing x to the left, all other terms to the right
-5x=11
x=11/-5
x=-2+1/5
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