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6q-15q+-4q-8q+16q=-15
We move all terms to the left:
6q-15q+-4q-8q+16q-(-15)=0
We add all the numbers together, and all the variables
-5q+15=0
We move all terms containing q to the left, all other terms to the right
-5q=-15
q=-15/-5
q=+3
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