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x in (-oo:+oo)
(3/5)*x = 120000 // - 120000
(3/5)*x-120000 = 0
3/5*x-120000 = 0 // + 120000
3/5*x = 120000 // : 3/5
x = 120000/3/5
x = 200000
x = 200000
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