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x in (-oo:+oo)
x/5 = 12-(x/10) // - 12-(x/10)
x/5+x/10-12 = 0
3/10*x-12 = 0 // + 12
3/10*x = 12 // : 3/10
x = 12/3/10
x = 40
x = 40
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