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x in (-oo:+oo)
(2/5)*x-((1/2)*x) = 9/10 // - 9/10
(2/5)*x-((1/2)*x)-(9/10) = 0
(2/5)*x+(-1/2)*x-9/10 = 0
-1/10*x-9/10 = 0 // + 9/10
-1/10*x = 9/10 // : -1/10
x = 9/10/(-1/10)
x = -9
x = -9
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