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x in (-oo:+oo)
(2/7)*y = 2*x-5 // - 2*x-5
(2/7)*y-(2*x)+5 = 0
(2/7)*y-2*x+5 = 0
2/7*y-2*x+5 = 0 // - 2/7*y+5
-2*x = -(2/7*y+5) // : -2
x = (-(2/7*y+5))/(-2)
x = (2/7*y+5)/2
x = (2/7*y+5)/2
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