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x in (-oo:+oo)
-2/3 = (1/5)*x-(1/2) // - (1/5)*x-(1/2)
1/2-((1/5)*x)-2/3 = 0
(-1/5)*x-2/3+1/2 = 0
-1/5*x-1/6 = 0 // + 1/6
-1/5*x = 1/6 // : -1/5
x = 1/6/(-1/5)
x = -5/6
x = -5/6
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