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x in (-oo:+oo)
-((1/6)*x)-5 = (2/5)*x-5 // - (2/5)*x-5
5-((1/6)*x)-((2/5)*x)-5 = 0
(-1/6)*x+(-2/5)*x-5+5 = 0
-17/30*x = 0 // : -17/30
x = 0
x = 0
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