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3y:4x = 1
3y = 4x
3y-4x = 0
4:5 = x+4 : y+4
4y+16 = 5x+20
4y-5x= 4
3y-4x=0|x4|
4y-5x=4|x3|
12y-16x=0
12y-15x=12
----------- -
0 -1x = -12
x=12
subtitusi:
3y = 0+(4*12)
y= 16
x+y = 12+16
x+y = 28