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y(-7)-18=-84
We move all terms to the left:
y(-7)-18-(-84)=0
We add all the numbers together, and all the variables
y(-7)+66=0
We multiply parentheses
-7y+66=0
We move all terms containing y to the left, all other terms to the right
-7y=-66
y=-66/-7
y=9+3/7
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