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= 10y + 20 -10y + 16 = 6 - 4y
= 10y -10y + 4y = 6 - 20 - 16
= 4y = -30
= y = -30/4
= y = -7,5
10y + 20 - 10y -16 = 6- 4y
10y - 10y + 20 -16 = 6 - 4y
4 = 6 - 4y
4y = 6-4
y =
y = atau 0,5