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x in (-oo:+oo)
A = (7/8)*R+20 // - (7/8)*R+20
A-((7/8)*R)-20 = 0
A+(-7/8)*R-20 = 0
A-7/8*R-20 = 0
x naleu017Cy do R
x in (-oo:+oo)
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