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3x-4y+3y/4+4x-2y-9/3=4
2x-x-y-2y+3y/3=16/4-3/4
3x+4x-4y-2y+3y/4=12/3+9/3
x-3y+3y/3=13/4 |razy 3
7x-6y+3y/4=21/3 | razy 4
3x-9y+3y=39/4 | razy 4
28x-24y+3y=84/3 |razy 3
3x-9y+3y=39/4 | razy 4
28x-24y+3y=84/3 |razy 3
12x-36y+12y=39
84x-72y+9y=84
12x-24y=39
84x-63y=84
12x=39+24y
84x-63y=84
12x=39+24y
7(39+24y)-63y=84
12x=39+24y
273+168y-63y=84
12x=39+24y
105y=-189
12x=39+24y
y=-189/105
12x=39+24y
y=-63/35
12x=39+24(-9/5)
y=-9/5
12x=195/5+216/5
y=-9/5
x=411/5 × 1/12
y=-9/5
x=6 i 51/60
y=-9/5
-------------------------------------
przy twoim
5x+2y=42 | razy 3
13x-6y=75
15x+6y=126
13x-6y=75
------------
28x=201
x=201/28
15(201/28)+6y=126
6y=3528/28-3015/28
6y=513/28
y=513/168
y=3 i 9/168
13x-6y=75
y = 21- 2,5x
13x-6*(21- 2,5y)=75
y = 21- 2,5x
13x-126+15x=75
y = 21- 2,5x
28x=201 / :28
y = 21- 2,5x
x=7,18
y = 21- 2,5*(7,18)
x=7,18
y = 21- 17,95
x=7,18
y=3,05
x=7,18