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x in (-oo:+oo)
x/9 = 14.4 // - 14.4
x/9-14.4 = 0
1/9*x-14.4 = 0 // + 14.4
1/9*x = 14.4 // : 1/9
x = 14.4/1/9
x = 129.6000013
x = 129.6000013
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