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x in (-oo:+oo)
a = (2/5)*b-3 // - (2/5)*b-3
a-((2/5)*b)+3 = 0
a+(-2/5)*b+3 = 0
a-2/5*b+3 = 0
x naleu017Cy do R
x in (-oo:+oo)
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