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X in (-oo:+oo)
(4*X)/0.2-4.5 = 61.5 // - 61.5
(4*X)/0.2-61.5-4.5 = 0
20*X-66 = 0 // + 66
20*X = 66 // : 20
X = 66/20
X = 33/10
X = 33/10
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