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