y-1=-1/2(x-7)

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Solution for y-1=-1/2(x-7) equation: 


x in (-oo:+oo)

y-1 = (-1/2)*(x-7) // - (-1/2)*(x-7)

y-((-1/2)*(x-7))-1 = 0

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

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

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

1/2*x+y-7/2-1 = 0

1/2*x+y-9/2 = 0

1/2*x+y-9/2 = 0

1/2*x+y-9/2 = 0 // - y-9/2

1/2*x = -(y-9/2) // : 1/2

x = (-(y-9/2))/1/2

x = 2*(9/2-y)

x = 2*(9/2-y)

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