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x in (-oo:+oo)
(-1/2)*x-(1/2) = 1/5 // - 1/5
(-1/2)*x-(1/2)-(1/5) = 0
(-1/2)*x-1/2-1/5 = 0
-1/2*x-7/10 = 0 // + 7/10
-1/2*x = 7/10 // : -1/2
x = 7/10/(-1/2)
x = -7/5
x = -7/5
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