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x in (-oo:+oo)
(-1/3)*x-(4/5) = 1/2 // - 1/2
(-1/3)*x-(4/5)-(1/2) = 0
(-1/3)*x-4/5-1/2 = 0
-1/3*x-13/10 = 0 // + 13/10
-1/3*x = 13/10 // : -1/3
x = 13/10/(-1/3)
x = -39/10
x = -39/10
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