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y-4 = (5/4)*(x-5) // - (5/4)*(x-5)
y-((5/4)*(x-5))-4 = 0
(-5/4)*(x-5)+y-4 = 0
y-5/4*(x-5)-4 = 0
y-5/4*(x-5)-4 = 0
y-5/4*x-4+25/4 = 0
y-5/4*x+9/4 = 0
y-5/4*x+9/4 = 0
y-5/4*x+9/4 = 0 // - y+9/4
-5/4*x = -(y+9/4) // : -5/4
x = (-(y+9/4))/(-5/4)
x = 4/5*(y+9/4)
x = 4/5*(y+9/4)
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