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21y-1=4(15)+9(15)-38
We move all terms to the left:
21y-1-(4(15)+9(15)-38)=0
We add all the numbers together, and all the variables
21y-1-1292=0
We add all the numbers together, and all the variables
21y-1293=0
We move all terms containing y to the left, all other terms to the right
21y=1293
y=1293/21
y=61+4/7
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