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10y+20-10y+16 = 6-4y
36 = 6-4y
4y = 6-36
4y = -30
y = -30/4 = 7 2/4 = 7 1/2
2. 3y-2(2y-3) = 6(y-4)+9
3y-4y+6 = 6y-24+54
-y+6 = 6y+30
-y-6y = 30-6
-7y = 24
y = 24/7 = 3 3/7