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x in (-oo:+oo)
(-2/5)*x-((1/3)*x) = 3 // - 3
(-2/5)*x-((1/3)*x)-3 = 0
(-2/5)*x+(-1/3)*x-3 = 0
-11/15*x-3 = 0 // + 3
-11/15*x = 3 // : -11/15
x = 3/(-11/15)
x = -45/11
x = -45/11
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