3x+3y=0
-2x+6y=-24
2x+3y=-7
-4x-5y=13
x+3y=-2
x+y=2
9x-5y=-30
x+2y=12
541 divided by 2
5x-y-4z=3
-x+6y-3z=2
-4x-3y+11z=2
280x+80y=40
80x+100y+20z=400
20x+90z=440
16−116^{-1}16−1
16−116{-1}16−1
