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x in (-oo:+oo)
(-1/2)*x+2/5 = -1/3 // + -1/3
(-1/2)*x+2/5-(-1/3) = 0
(-1/2)*x+2/5+1/3 = 0
11/15-1/2*x = 0 // - 11/15
-1/2*x = -11/15 // : -1/2
x = -11/15/(-1/2)
x = 22/15
x = 22/15
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