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29=50-7y
We move all terms to the left:
29-(50-7y)=0
We add all the numbers together, and all the variables
-(-7y+50)+29=0
We get rid of parentheses
7y-50+29=0
We add all the numbers together, and all the variables
7y-21=0
We move all terms containing y to the left, all other terms to the right
7y=21
y=21/7
y=3
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