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3x-2y = -5+4
3x-2y= -1
3y-9=x+3
3y-x=3+9
3y-x=12
-x=12-3y /*(-1)
x=3y-12
3(3y-12)-2y=-1
9y-36-2y=-1
7y=-1+36
7y=35/:7
y=5
x=3*5-12
x=15-12
x=3
3y-9=x+3
3x-2y=-1
-x+3y=12|*3
3x-2y=-1
-3x+9y=36
7y=35
y=5
3x-2*5=-1
3x=9
x=3