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10y + 20 - 10y - 16 = 2y
4 = 2y
y = 4/2 = 2
(10y+20)-(10y-16)=2y
10y+20 -10y+16=2y
10y-10y+20+16=2y
36=2y
2y=36
y=36/2
y=18