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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| -2x-6y=4;6y=-2x-4 | | 4x+2y=-8;x-2y=13 | | 8x+4y=-32;12x-2y=-48 | | 4x-8y=48;8x+36y=8 | | 6x+14y=2;10x-14=-2 | | 4x+3y=-40;5x-y=-12 | | x+y=23;y=x-5 | | 4x+y=-40;5x-y=-12 | | y=3x+6;x-5y=10 | | 7x-2y=-8;x=-2 | | y=2x;3x-2y=-2 | | y=4-2x;y=7-3x | | 3x-2y=5;2x+5y=-3 | | 2x+3y=-1;5x-3y=29 | | 4x+3y=-4;3x-7y=34 | | x-2y=-12;2x+9y=2 | | x=-3y;7x-2y=-69 | | x+y=0;x-y=0 | | x=-3;7x-2y=-69 | | x+y=20;x=y-4 | | 2x+y=12;3x-y=13 | | 7y+5y=60;7y+5y=60 | | 8x-6y=14;12x-9y=18 | | 3y=11-2x;3x=y-11 | | 2x+5y=3;x-3y=7 | | 4x-y=5;4x+4y=-4 | | 7/11x+5/11;-2/11x-1/55 | | 8/11;u/4 | | -3;-8/7+u | | u+1/u+5+1;u+3/u+2 | | 3a+27/8a;b+1 | | 5x+3x=7;-3x+6y=-12 |