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x in (-oo:+oo)
x/40 = 9.6/48 // - 9.6/48
x/40-(9.6/48) = 0
x/40-0.2 = 0
1/40*x-0.2 = 0 // + 0.2
1/40*x = 0.2 // : 1/40
x = 0.2/1/40
x = 8
x = 8
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