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x in (-oo:+oo)
x/15 = (400/83)/4 // - (400/83)/4
x/15-((400/83)/4) = 0
x/15-100/83 = 0
1/15*x-100/83 = 0 // + 100/83
1/15*x = 100/83 // : 1/15
x = 100/83/1/15
x = 1500/83
x = 1500/83
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