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2a+10=6a-30
We move all terms to the left:
2a+10-(6a-30)=0
We get rid of parentheses
2a-6a+30+10=0
We add all the numbers together, and all the variables
-4a+40=0
We move all terms containing a to the left, all other terms to the right
-4a=-40
a=-40/-4
a=+10
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