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x in (-oo:+oo)
1/5-((1/2)*x) = 3/2 // - 3/2
1/5-((1/2)*x)-(3/2) = 0
(-1/2)*x+1/5-3/2 = 0
-1/2*x-13/10 = 0 // + 13/10
-1/2*x = 13/10 // : -1/2
x = 13/10/(-1/2)
x = -13/5
x = -13/5
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