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x in (-oo:+oo)
(1/2)*(x-y) = 8 // - 8
(1/2)*(x-y)-8 = 0
1/2*(x-y)-8 = 0
1/2*(x-y)-8 = 0
1/2*x-1/2*y-8 = 0
1/2*x-1/2*y-8 = 0
1/2*x-1/2*y-8 = 0 // + -1/2*y-8
1/2*x = -(-1/2*y-8) // : 1/2
x = (-(-1/2*y-8))/1/2
x = 2*(8-(-1/2*y))
x = 2*(8-(-1/2*y))
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