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x in (-oo:+oo)
57/5 = 5*x+(1/2)*x+2/5 // - 5*x+(1/2)*x+2/5
57/5-(5*x)-((1/2)*x)-(2/5) = 0
(-1/2)*x-5*x+57/5-2/5 = 0
11-11/2*x = 0 // - 11
-11/2*x = -11 // : -11/2
x = -11/(-11/2)
x = 2
x = 2
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