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3x-4y=12 *4 12x-16y=48
---------------- -
20y=-22
y= -22/20= -1,1
3x-4y=12
3x-4(-1,1)=12
3x-4,4 = 12
3x= 12+4,4 =16,4
x = 16,4 / 3 = 5,467