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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| -x+3y=14;x+3y=16 | | -4x-y=2;3x+y=1 | | -4x+5y=24;5x-5y=-30 | | 2x+2y=-4;x+2y=-3 | | 3x+y=17;5x+y=29 | | 4x-2y=30;-4x+5y=-45 | | 3x-y=-26;x+y=-2 | | 5x-27-y;27x+14y=2040 | | 5x-y=27;27x+14y=2040 | | 0.05+0.01y=2.7;0.27x+0.14y=20.4 | | 1/5x+1/2y=9/10;1/5x+4y=57/5 | | 3x+5y=-8;x-15y=-36 | | 9x+5y=15;x=38-8y | | 3x-7y=15;5x+4y=-25 | | 4x-y=-5;x+y=10 | | 18x-9y=45;y=2x+5 | | 15x-20y=7;5y=-4+15x | | 6x+7y=24;x=39-7y | | 9x-y=83;7x-4y=55 | | -18x+18y=-6480;18x+18y=3600 | | -6x-6y=-1680;6x+7y=3360 | | 5x+3y=38;5x+9y=44 | | 3x-7y=7;9x-21y=26 | | 2x=8+2y;-6/5x+y=-31/5 | | 135x+45y=-11;81x-13=75y | | -x+6y=3;-3x+18y=9 | | -x+6y=3;-3x+18y-9 | | 2x-9y=0;4x+7y=0 | | 3x-7y=24;-5x+4y=-40 | | 2x+y=17;6x+2y=48 | | 5x+y=-6;7x-3y=-26 | | -4x-4y=36;-x+16y=26 |