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5/a+6/b+7/c+8/d+9/e = 19.98 // - 19.98
5/a+6/b+7/c+8/d+9/e-19.98 = 0
5*a^-1+6*b^-1+7*c^-1+8*d^-1+9/e-19.98 = 0
x naleu017Cy do R
x in (-oo:+oo)
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