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Remember to put linear equations with variables x and y.
for example:
2x+y=8
x+3y=14
| 5p+4q-14=0;17p=31+3q | | 4x+3y=18;9x-3y=21 | | 3x+6y=24;x=-3y+10 | | 8x+4y=40;x+y=-4 | | a+b=28;a-b=12 | | (a+b)/4=45;(a-b)/3=4 | | 5x+2y=4600;8x+5y=7900 | | 5x+3y=4600;8x+5y=7900 | | x+2y=15;x-y=3 | | x-5y=8;-7x+8y=25 | | 4y+3x=8;8x-9y=-77 | | 5x+7y=-1;-3x+4y=-24 | | 2x-y=-20;-3x+5y=12 | | 3x+y=8;5x+y=3 | | x-3y=-30;-6x-4y=-18 | | 2x+4y=-32;6x-2y=-12 | | (6x+9);(x^2-3x+1) | | 5x-12=3x+y-4;y/2+5x=8 | | 2x-1y=180;2x-1y=180 | | 7x+2y=6;6x-2y=8 | | 4x+6y=9;y=5-3x | | x+5y=5;3x-10y=5 | | -2x-6y=2;24y=-8x-8 | | y=2x-2;y-2x=9 | | -7x+y=-19;-2x+3y=-19 | | 4y+3=3y+x;2x+4y=18 | | 4x=3y-2;18=3x+y | | 2x+2y=38;y=x+3 | | 3x+2y=23;0.5x-4=y | | 3x+2y=23;1/2x-4=y | | x+x;32 | | y=1/2x+2;x-2y=-4 |