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x in (-oo:+oo)
x-((3/8)*(x-25000))-25000 = 0
(-3/8)*(x-25000)+x-25000 = 0
x-3/8*(x-25000)-25000 = 0
x-3/8*(x-25000)-25000 = 0
5/8*x-25000+9375 = 0
5/8*x-15625 = 0
5/8*x-15625 = 0
5/8*x-15625 = 0 // + 15625
5/8*x = 15625 // : 5/8
x = 15625/5/8
x = 25000
x = 25000
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