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105=7(5a+5)
We move all terms to the left:
105-(7(5a+5))=0
We calculate terms in parentheses: -(7(5a+5)), so:We get rid of parentheses
7(5a+5)
We multiply parentheses
35a+35
Back to the equation:
-(35a+35)
-35a-35+105=0
We add all the numbers together, and all the variables
-35a+70=0
We move all terms containing a to the left, all other terms to the right
-35a=-70
a=-70/-35
a=+2
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