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3x-2y=12 /*(-4)
12x+3y=15
-12x+8y=-48
-------------------------
11y= -33 /:11
y= -3
4x+(-3)=5
4x-3=5
4x=5+3
4x=8 /:4
x=2
3x+4y=6
-x-2y=-4 /*3
3x+4y=6
-3x+6y=-12
---------------------
10y= -6
y= -6/10
y= -3/5
-x-2*(-3/5)=-4
-x+6/5= -4
-x= -4-1i1/5
-x= -5i1/5 /*(-1)
x=5i1/5