Answer
r = 13
q = -2
step by step
12q + 3r = 15 | ×1 |
-4q - 4r = -44 | ×3 |
12q + 3r = 15
-12q - 12r = -132
____________+
-9r = -117
r = -117/-9
12q + 3(13) = 15
12q + 39 = 15
12q = 15 - 39
12q = -24
q = -24/12
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