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-7y/8=-21
We move all terms to the left:
-7y/8-(-21)=0
We add all the numbers together, and all the variables
-7y/8+21=0
We multiply all the terms by the denominator
-7y+21*8=0
We add all the numbers together, and all the variables
-7y+168=0
We move all terms containing y to the left, all other terms to the right
-7y=-168
y=-168/-7
y=+24
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