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x in (-oo:+oo)
(2/5)*x-((1/4)*x) = 9.6 // - 9.6
(2/5)*x-((1/4)*x)-9.6 = 0
(2/5)*x+(-1/4)*x-9.6 = 0
3/20*x-9.6 = 0 // + 9.6
3/20*x = 9.6 // : 3/20
x = 9.6/3/20
x = 64
x = 64
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