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0=(100-2q)-20
We move all terms to the left:
0-((100-2q)-20)=0
We add all the numbers together, and all the variables
-((-2q+100)-20)+0=0
We add all the numbers together, and all the variables
-((-2q+100)-20)=0
We calculate terms in parentheses: -((-2q+100)-20), so:We get rid of parentheses
(-2q+100)-20
We get rid of parentheses
-2q+100-20
We add all the numbers together, and all the variables
-2q+80
Back to the equation:
-(-2q+80)
2q-80=0
We move all terms containing q to the left, all other terms to the right
2q=80
q=80/2
q=40
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