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-75=-3(3a+10)
We move all terms to the left:
-75-(-3(3a+10))=0
We calculate terms in parentheses: -(-3(3a+10)), so:We get rid of parentheses
-3(3a+10)
We multiply parentheses
-9a-30
Back to the equation:
-(-9a-30)
9a+30-75=0
We add all the numbers together, and all the variables
9a-45=0
We move all terms containing a to the left, all other terms to the right
9a=45
a=45/9
a=5
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