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x in (-oo:+oo)
x+(3/6)*x+2*x-((30/6)*x) = 5 // - 5
x+(3/6)*x+2*x-((30/6)*x)-5 = 0
x+(3/6)*x+2*x-5*x-5 = 0
-3/2*x-5 = 0 // + 5
-3/2*x = 5 // : -3/2
x = 5/(-3/2)
x = -10/3
x = -10/3
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