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y-9 = (7/5)*(x-5) // - (7/5)*(x-5)
y-((7/5)*(x-5))-9 = 0
(-7/5)*(x-5)+y-9 = 0
y-7/5*(x-5)-9 = 0
y-7/5*(x-5)-9 = 0
y-7/5*x-9+7 = 0
y-7/5*x-2 = 0
y-7/5*x-2 = 0
y-7/5*x-2 = 0 // - y-2
-7/5*x = -(y-2) // : -7/5
x = (-(y-2))/(-7/5)
x = -5/7*(2-y)
x = -5/7*(2-y)
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