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x in (-oo:+oo)
x/40 = 5/8 // - 5/8
x/40-(5/8) = 0
x/40-5/8 = 0
1/40*x-5/8 = 0 // + 5/8
1/40*x = 5/8 // : 1/40
x = 5/8/1/40
x = 25
x = 25
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