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4x+12y-7=0
4x+6y=14\*-2
4x+12y=7
-8x-12y=-28
4x-12y=7
4x=21/4
x=5.25
21+6y=7
6y=14/6
y=-2.33
licze na naj
4x+12y-7=0
-8x-12y=-28
4x+12y=7
-4x=-21 | :(-4)
x=5.25
4*5.25+6y=14
21+6y=14
6y=14-21
6y=-7 |:6
y= -7/6
4x+12y-7=0 | -7
4x+6y=14
4x+12y=7 | *(-1)
4x+6y=14
-4x-12y=- 7
-6y=7 | :6
y= -7/6 | * (-1)
y= 7/6
4x+6*7/6= 14
4x+7=14 |-7
4x=14 - 7
4x= 7 | :4
x=7/4
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