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170=-5(1+7a)
We move all terms to the left:
170-(-5(1+7a))=0
We add all the numbers together, and all the variables
-(-5(7a+1))+170=0
We calculate terms in parentheses: -(-5(7a+1)), so:We get rid of parentheses
-5(7a+1)
We multiply parentheses
-35a-5
Back to the equation:
-(-35a-5)
35a+5+170=0
We add all the numbers together, and all the variables
35a+175=0
We move all terms containing a to the left, all other terms to the right
35a=-175
a=-175/35
a=-5
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