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3x+4y=18 /razy 3
16x-12y=-4
9x+12y=54
16x+9x-12y+12y=54-4
16x+9x=50
25x=50 /dzielone przez 25
x=2
3x+4y=18
3razy2+4y=18
6+4y=18
4y=18-6
4y=12/ dzielone przez 4
y=3