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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| 4x+3y=5;-2x+5y+17 | | 2y=4x+8;2y=4x-7 | | x-6;8x+10y80 | | y=6/5x-6;y=2x+8 | | x7;5x+2y10 | | y=-10/7x+10;x=-5 | | -2x+y=5;5x+3y=-7 | | Y=4x-5;Y=8x+6 | | 2^x-4=0;x^2-4x+3=0 | | x+y=1/60;12x+36y=1 | | x+y=2;3x-2y=1 | | -6x-7y=42;x=-6 | | 3+2x-y=0;-3-7y=10x | | -14=-20y-7x;10y+4=2x | | 5x+4y=-14;3x+6y=6 | | -x-7y=14;-4x-14y=28 | | 2x+8y=6;-5x-20y=-15 | | -4x-2y=14;-10x+7y=-25 | | 5x+4y=-30;3x-9y=-18 | | -7x-8y=9;-4x+9y=-22 | | -4x-15y=-17;-x+5y=-13 | | -4x+9y=9;x-3y=-6 | | 5x+y=9;10x-7y=-18 | | 7x+2y=24;8x+2y=30 | | 8x+y=-16;-3x+y=-5 | | -6x+5y=1;6x+4y=-10 | | 4x+8y=20;-4x+2y=-30 | | -6x+6y=6;-6x+3y=-12 | | 2x-y=17;5x+3y=26 | | x+12=-7;x+12=-7 | | x+y=3;y=2x-15 | | 6x+1;x=5 |