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100=5(7a+6)
We move all terms to the left:
100-(5(7a+6))=0
We calculate terms in parentheses: -(5(7a+6)), so:We get rid of parentheses
5(7a+6)
We multiply parentheses
35a+30
Back to the equation:
-(35a+30)
-35a-30+100=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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