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Metoda podstawiania:
4x+3y=56
8x=96+12y wymnożyłam sobie
4x+3y=56/*(-2)
8x-12y=96
-8x-6y=-112
8x-12y=96 odejmujemy stronami
-18y=-16
y=16/18=8/9
4x+3y=56
4x=56-3*8/9
4x=56-24/9
x=14-24/36
x=480/36
x=80/6=40/3