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(10.a)=30
We move all terms to the left:
(10.a)-(30)=0
We add all the numbers together, and all the variables
(+10.a)-30=0
We get rid of parentheses
10.a-30=0
We move all terms containing a to the left, all other terms to the right
10.a=30
a=30/10.
a=3
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