Solve for y
y=-21
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51+40+y+50=120
Add 23 and 28 to get 51.
91+y+50=120
Add 51 and 40 to get 91.
141+y=120
Add 91 and 50 to get 141.
y=120-141
Subtract 141 from both sides.
y=-21
Subtract 141 from 120 to get -21.
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