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2x = 5-4 //:2
4x-8y=10
x=0.5
4x=10-8y
4*0.5=10-8y
2-10 = -8y
y=1
x=0.5
b)
w drugim ukladzie 1 r-nie = 2-rnie
2x=1
x=1/2
i rób takim sposobem:)