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77=2x+39
We move all terms to the left:
77-(2x+39)=0
We get rid of parentheses
-2x-39+77=0
We add all the numbers together, and all the variables
-2x+38=0
We move all terms containing x to the left, all other terms to the right
-2x=-38
x=-38/-2
x=+19
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