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Y-13 = (5/4)*(x-7) // - (5/4)*(x-7)
Y-((5/4)*(x-7))-13 = 0
(-5/4)*(x-7)+Y-13 = 0
Y-5/4*(x-7)-13 = 0
Y-5/4*(x-7)-13 = 0
Y-5/4*x-13+35/4 = 0
Y-5/4*x-17/4 = 0
Y-5/4*x-17/4 = 0
Y-5/4*x-17/4 = 0 // - Y-17/4
-5/4*x = -(Y-17/4) // : -5/4
x = (-(Y-17/4))/(-5/4)
x = -4/5*(17/4-Y)
x = -4/5*(17/4-Y)
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