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x in (-oo:+oo)
x/0.8 = 7.2 // - 7.2
x/0.8-7.2 = 0
1.25*x-7.2 = 0 // + 7.2
1.25*x = 7.2 // : 1.25
x = 7.2/1.25
x = 5.76
x = 5.76
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