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x in (-oo:+oo)
1/5-((1/8)*x) = 3/8 // - 3/8
1/5-((1/8)*x)-(3/8) = 0
(-1/8)*x+1/5-3/8 = 0
-1/8*x-7/40 = 0 // + 7/40
-1/8*x = 7/40 // : -1/8
x = 7/40/(-1/8)
x = -7/5
x = -7/5
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