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y-tulipan
0,8x + y = 110
1,2x + 1,6y = 168
y = 110 - 0,8x
1,2x + 1,6(110 - 0,8x) = 168
1,2x + 176 - 1,28x = 168 || +0,08x || -168
8 = 0,08x
x = 100
y= 110 - 0,8*100 = 30