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y-7 = (-1/2)*(x-3) // - (-1/2)*(x-3)
y-((-1/2)*(x-3))-7 = 0
(1/2)*(x-3)+y-7 = 0
1/2*(x-3)+y-7 = 0
1/2*(x-3)+y-7 = 0
1/2*x+y-7-3/2 = 0
1/2*x+y-17/2 = 0
1/2*x+y-17/2 = 0
1/2*x+y-17/2 = 0 // - y-17/2
1/2*x = -(y-17/2) // : 1/2
x = (-(y-17/2))/1/2
x = 2*(17/2-y)
x = 2*(17/2-y)
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