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x in (-oo:+oo)
(2*x-5)/7 = 5/2 // - 5/2
(2*x-5)/7-(5/2) = 0
(2*x-5)/7-5/2 = 0
(2*(2*x-5))/(2*7)+(-5*7)/(2*7) = 0
2*(2*x-5)-5*7 = 0
4*x-45 = 0
(4*x-45)/(2*7) = 0
(4*x-45)/(2*7) = 0 // * 2*7
4*x-45 = 0
4*x-45 = 0 // + 45
4*x = 45 // : 4
x = 45/4
x = 45/4
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