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X in (-oo:+oo)
7.4*X+(1/5)*X-(3/2) = (4/5)*X // - (4/5)*X
7.4*X+(1/5)*X-((4/5)*X)-(3/2) = 0
7.4*X+(1/5)*X+(-4/5)*X-3/2 = 0
6.8*X-3/2 = 0 // + 3/2
6.8*X = 3/2 // : 6.8
X = 3/2/6.8
X = 0.22058824
X = 0.22058824
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