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y-13 = (-5/3)*(x-7) // - (-5/3)*(x-7)
y-((-5/3)*(x-7))-13 = 0
(5/3)*(x-7)+y-13 = 0
5/3*(x-7)+y-13 = 0
5/3*(x-7)+y-13 = 0
5/3*x+y-13-35/3 = 0
5/3*x+y-74/3 = 0
5/3*x+y-74/3 = 0
5/3*x+y-74/3 = 0 // - y-74/3
5/3*x = -(y-74/3) // : 5/3
x = (-(y-74/3))/5/3
x = 3/5*(74/3-y)
x = 3/5*(74/3-y)
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