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-6x+(-7x-18)=189
We move all terms to the left:
-6x+(-7x-18)-(189)=0
We get rid of parentheses
-6x-7x-18-189=0
We add all the numbers together, and all the variables
-13x-207=0
We move all terms containing x to the left, all other terms to the right
-13x=207
x=207/-13
x=-15+12/13
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