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m = (2 - 5)/(6 + 7)
m = -3/13
y-5 / -3 = (x + 7) / 13
y- 5 = -3(x + 7) / 13
y - 5 = (-3x -21) /13
13 y - 65 = -3x -21
13y = -3x + 44
y = -3/13 x +44/13
gradiennya = -3/13