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zatem
x-4 = 6(y-4) drugie równanie wyliczyć y
maciek: x
marek: y
x+y=36
x-4= 6*(y-4)
x+y=36
x-4= 6y-24
x+y=36
x-6y= -24+4
a dalej to chyba już wiesz ;)