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40=-10(q-99)
We move all terms to the left:
40-(-10(q-99))=0
We calculate terms in parentheses: -(-10(q-99)), so:We get rid of parentheses
-10(q-99)
We multiply parentheses
-10q+990
Back to the equation:
-(-10q+990)
10q-990+40=0
We add all the numbers together, and all the variables
10q-950=0
We move all terms containing q to the left, all other terms to the right
10q=950
q=950/10
q=95
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