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-78=9x+3
We move all terms to the left:
-78-(9x+3)=0
We get rid of parentheses
-9x-3-78=0
We add all the numbers together, and all the variables
-9x-81=0
We move all terms containing x to the left, all other terms to the right
-9x=81
x=81/-9
x=-9
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