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189=69-y
We move all terms to the left:
189-(69-y)=0
We add all the numbers together, and all the variables
-(-1y+69)+189=0
We get rid of parentheses
1y-69+189=0
We add all the numbers together, and all the variables
y+120=0
We move all terms containing y to the left, all other terms to the right
y=-120
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