1) 2(x-3y)=0
x=-4-y
x-3y=0
x=-4-y
-4-y-3y=0
x=-4-y
-4-4y=0
x=-4-y
4y=-4
x=-4-y
y=-1
x=-4-1
y=-1
x=-5
2) 4x-3y=14
x=-2-2y
4(-2-2y)-3y=14
x=-2-2y
-8-8y-3y=14
x=-2-2y
-11y=14+8
x=-2-2y
-11y=22
x=-2-2y
y=-22:11
x=-2-2y
y=-2
x=-2-2(-2)
y=-2
x=-2+4
y=-2
x=2
3) x-x+5y-4y=3-2
x=2-4y
y=1
x=2-4y
y=1
x=2-4
y=1
x=-2