-3x + 4y = 7 |*2 2x - 3y = -6 | *3
-6x + 8y = 14
6x - 9y = -18
-y = -4
y = 4
-3x + 4y = 7 |*3 2x - 3y = -6| *4
-9x + 12y = 21
8x - 12y = -24
-x =-3
x=3
;DD
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-3x + 4y = 7 |*2
2x - 3y = -6 | *3
-6x + 8y = 14
6x - 9y = -18
-y = -4
y = 4
-3x + 4y = 7 |*3
2x - 3y = -6| *4
-9x + 12y = 21
8x - 12y = -24
-x =-3
x=3
;DD