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(-2a+10)=130
We move all terms to the left:
(-2a+10)-(130)=0
We get rid of parentheses
-2a+10-130=0
We add all the numbers together, and all the variables
-2a-120=0
We move all terms containing a to the left, all other terms to the right
-2a=120
a=120/-2
a=-60
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