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8 + 4x = 20
4x = 20 - 8
4x = 12
x = 3
4/2 = 4+6+3 / 2 + x + y
4/2 = 13 / 5 + y
20 + 4y = 26
4y = 6
y = 6/4 = 1.5
4x = 12
x = 12/4 = 3
10/5 = 3/y
10y = 15
y = 15/10 = 1,5
z tw. Talesa mamy:
4/2=6/x
teraz na krzyz
2*6=4*x
4x=12 /:4
x=3
4/2=3/y
2*3=4*y
4y=6
y=6:4
y=1,5