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y - 10 / 1 - 10 = x -(-2) / 1 -(-2)
y - 10 / -9 = x + 2 / 3
-9x - 18 = 3y - 30
-9x = 3y - 30 + 18
-9x = 3y - 12
-9x - 3y + 12 = 0
9x + 3y - 12 = 0
9(3) + 3y - 12 = 0
27 + 3y - 12 = 0
3y +15 = 0
3y = -15
y = -15 / 3
y = -5
y = d
d = -5