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9=2(q+1)+1
We move all terms to the left:
9-(2(q+1)+1)=0
We calculate terms in parentheses: -(2(q+1)+1), so:We get rid of parentheses
2(q+1)+1
We multiply parentheses
2q+2+1
We add all the numbers together, and all the variables
2q+3
Back to the equation:
-(2q+3)
-2q-3+9=0
We add all the numbers together, and all the variables
-2q+6=0
We move all terms containing q to the left, all other terms to the right
-2q=-6
q=-6/-2
q=+3
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