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3y-9=x+3
3x-4=2y-5
x=3y-12
3(3y-12)-4=2y-5
x=3y-12
9y-36-4=2y-5
x=3y-12
9y-2y=-5+36+4
x=3y-12
7y=31+4
x=3y-12
7y=35
x=3y-12
y=5
x=3
x=y+1
2x=5x-4y
x=y+1
-3x=-4y
x=y+1
-3(y+1)=y+1
x=y+1
-3y-3=y+1
x=y+1
-4y=4
x=y+1
y=-1
x=0
y=-1
3y-9=x+3
3x-4=2y-5
x=3y-12
3(3y-12)-4=2y-5
x=3y-12
9y-36-4=2y-5
x=3y-12
9y-2y=-5+36+4
x=3y-12
7y=31+4
x=3y-12
7y=35
x=3y-12
y=5
x=3
__________________
x=y+1
2x=5x-4y
x=y+1
2x-5x=-4y
x=y+1
-3x=-4y
x=y+1
-3*(y+1)=-4y
x=y+1
-3y-3=-4y
x=y+1
-3y+4y=3
x=y+1
y=3
x=3+1
y=3
x=4
y=3