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y-10 = (-7/3)*(x-9) // - (-7/3)*(x-9)
y-((-7/3)*(x-9))-10 = 0
(7/3)*(x-9)+y-10 = 0
7/3*(x-9)+y-10 = 0
7/3*(x-9)+y-10 = 0
7/3*x+y-21-10 = 0
7/3*x+y-31 = 0
7/3*x+y-31 = 0
7/3*x+y-31 = 0 // - y-31
7/3*x = -(y-31) // : 7/3
x = (-(y-31))/7/3
x = 3/7*(31-y)
x = 3/7*(31-y)
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