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