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9y+8y=5+12
We move all terms to the left:
9y+8y-(5+12)=0
We add all the numbers together, and all the variables
9y+8y-17=0
We add all the numbers together, and all the variables
17y-17=0
We move all terms containing y to the left, all other terms to the right
17y=17
y=17/17
y=1
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