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210=6a+6(5+5a)
We move all terms to the left:
210-(6a+6(5+5a))=0
We add all the numbers together, and all the variables
-(6a+6(5a+5))+210=0
We calculate terms in parentheses: -(6a+6(5a+5)), so:We get rid of parentheses
6a+6(5a+5)
We multiply parentheses
6a+30a+30
We add all the numbers together, and all the variables
36a+30
Back to the equation:
-(36a+30)
-36a-30+210=0
We add all the numbers together, and all the variables
-36a+180=0
We move all terms containing a to the left, all other terms to the right
-36a=-180
a=-180/-36
a=+5
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