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y-5 = (-1/5)*(x-1) // - (-1/5)*(x-1)
y-((-1/5)*(x-1))-5 = 0
(1/5)*(x-1)+y-5 = 0
1/5*(x-1)+y-5 = 0
1/5*(x-1)+y-5 = 0
1/5*x+y-5-1/5 = 0
1/5*x+y-26/5 = 0
1/5*x+y-26/5 = 0
1/5*x+y-26/5 = 0 // - y-26/5
1/5*x = -(y-26/5) // : 1/5
x = (-(y-26/5))/1/5
x = 5*(26/5-y)
x = 5*(26/5-y)
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