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10y + 20 - 10y + 26 - 6 + 4y = 0
4y + 40 = 0
y = - 10
10y + 20 - 10y + 16 = 6 - 4y
36 = 6 - 4y
36 - 6 = - 4 y
30 = - 4y
y = 30 : - 4
y = -7,5