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-18+7-q=-4+9
We move all terms to the left:
-18+7-q-(-4+9)=0
We add all the numbers together, and all the variables
-q-18+7-5=0
We add all the numbers together, and all the variables
-1q-16=0
We move all terms containing q to the left, all other terms to the right
-q=16
q=16/-1
q=-16
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