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x in (-oo:+oo)
1/5-((1/2)*x) = (10/10)*x // - (10/10)*x
1/5-((1/2)*x)-((10/10)*x) = 0
(-1/2)*x-x+1/5 = 0
1/5-3/2*x = 0 // - 1/5
-3/2*x = -1/5 // : -3/2
x = -1/5/(-3/2)
x = 2/15
x = 2/15
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