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10y + 20 - 10y + 16= 6 - 4y
10y - 10y + 20 + 16= 6 - 4y
36= 6 - 4y
36 - 6= -4y
30= -4y
-4y= 30
y= 30/-4
y= -15/2
y= -7 1/2