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77=2a+72
We move all terms to the left:
77-(2a+72)=0
We get rid of parentheses
-2a-72+77=0
We add all the numbers together, and all the variables
-2a+5=0
We move all terms containing a to the left, all other terms to the right
-2a=-5
a=-5/-2
a=2+1/2
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