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3y=7 - 6x => 6x + 3y = 7
-2x + 4y = -8 |x6| -12x+24y=48
6x + 3y = 7 |x2| 12x+6y=14
--------------------- +
30y=52
y=52/30
y = 26/15
-2x + 4y = -8 |x3| -6x+ 12y = -24
6x + 3y = 7 |x4| 24x+12y= 28
--------------------- -
-30x=-52
x=-52/-30
x= 26/15
{26/15 , 26/15}