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y-3 = (-2/5)*(x-10) // - (-2/5)*(x-10)
y-((-2/5)*(x-10))-3 = 0
(2/5)*(x-10)+y-3 = 0
2/5*(x-10)+y-3 = 0
2/5*(x-10)+y-3 = 0
2/5*x+y-4-3 = 0
2/5*x+y-7 = 0
2/5*x+y-7 = 0
2/5*x+y-7 = 0 // - y-7
2/5*x = -(y-7) // : 2/5
x = (-(y-7))/2/5
x = 5/2*(7-y)
x = 5/2*(7-y)
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