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2a+76=6a-4
We move all terms to the left:
2a+76-(6a-4)=0
We get rid of parentheses
2a-6a+4+76=0
We add all the numbers together, and all the variables
-4a+80=0
We move all terms containing a to the left, all other terms to the right
-4a=-80
a=-80/-4
a=+20
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