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100=150-2y
We move all terms to the left:
100-(150-2y)=0
We add all the numbers together, and all the variables
-(-2y+150)+100=0
We get rid of parentheses
2y-150+100=0
We add all the numbers together, and all the variables
2y-50=0
We move all terms containing y to the left, all other terms to the right
2y=50
y=50/2
y=25
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