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-78+2x=111+11x
We move all terms to the left:
-78+2x-(111+11x)=0
We add all the numbers together, and all the variables
2x-(11x+111)-78=0
We get rid of parentheses
2x-11x-111-78=0
We add all the numbers together, and all the variables
-9x-189=0
We move all terms containing x to the left, all other terms to the right
-9x=189
x=189/-9
x=-21
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