$16a + 23b + 12c + 34d -2e -37f + 109g -141h + 139i + 149j + 29k + 12l + 131m = 74608$
$13a + 31b -5c + 17d + 29e -67f -16g -101h -7i -201j + 32k + 17l + 171m = -4194$
$81a -12b -5c + 17d -9e + 17f + 39g + 49h -67i -7j -41k + 13l + 121m = -15793$
$91a -43b + 17c + 19d + 17e + 23f + 97g + 101h -101i + 173j -12k + 137l + 217m = -16661 $
$71a + 47b + 37c + 37d + 41e -37f -67g -17h -2i -6j + 41k -39l -12m = -6862 $
$61a + 13b + 101c + 7d + 117e + 111f -4g -3h -19i -2j + 13k + 17l -91m = 7802 $
$51a + 31b + 37c + 4d + 101e -13f -7g -13h -41i -3j + 31k + 73l -71m = 8846 $
$21a + 12b + 67c -67d -9e -67f + 9g + 98h + 101i + 171j + 13k + 191l -54m = -4544 $
$41a -2b + 5c + 17d + 18e + 19f + 20g + 21h + 22i + 23j -11k + 91l -2m = -4050 $
$31a + 100b + 2c + 4d + 5e + 10f -10g + 20h -50i -4j + 10k -67l -4m = -4459 $
$17a + 67b + 2c -2d -8e -78f -9g -101h + 107i + 145j + 21k -9l -10m = 37104 $
$11a + 3b + 4c + 71d -45e + 87f + 8g + 34h + 45i + 93j + 104k -8l -20m = 4737 $
$19a -3b -9c -12d + 123e + 61f + 71g + 83h + 91i + 10j + 11k -12l + 82m = 623$
How would I go about finding $a, b, c, d, e ... m $? I can use programming.