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x in (-oo:+oo)
(x^1)/15+2200 = 4000 // - 4000
(x^1)/15-4000+2200 = 0
x/15-4000+2200 = 0
1/15*x-1800 = 0 // + 1800
1/15*x = 1800 // : 1/15
x = 1800/1/15
x = 27000
x = 27000
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