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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| 4x+2y=0;y=1-3x | | 9x-y=60;-4x-4y=-40 | | 2x+y=8;2x+4y=14 | | x+4y=10;2x-3y=-13 | | 2x+y=-5;x-3y=-6 | | 6x+y=5;2x-3y=-5 | | 2x-3y=11;5x+y=2 | | 2x-3y=11;y-5x=-8 | | x=4y-1;x=4y+1 | | -x-3y=1;4x+3y=5 | | -5x-3y=-41;x-2y=-10 | | 4x-y=11;3x+5y=-9 | | x-2y=4;x-2y=4 | | 6x-9y=3;2x+4y=-6 | | 8x+10y=24;7x-6y=21 | | 21x-12;7 | | x+3y=6;4x-6y=12 | | -6x-4y=6;12y=-18x-18 | | 5x-y=12;10x-2y=20 | | 5x+4y=5;y=-2x-1 | | 5x+4y=15;y=-2x-1 | | x+3y=0;2x+7y=5 | | 6x+19y=252;2x+7y=96 | | x-y=4;3x-2y=-1 | | y=-x-4;2x+y=5 | | 4x+4y=13;x-2y=10 | | x=3y;2x-4y=10 | | 2x-y=1;x+2y=13 | | 17x+11y=276;2x+y=26 | | 3x-4y=24;5x+7y=-1 | | y=6-2x;y=3+x | | y=8+3x;y=33-2x |