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x in (-oo:+oo)
60*(1/2)*x+300*x = 9900 // - 9900
60*(1/2)*x+300*x-9900 = 0
330*x-9900 = 0 // + 9900
330*x = 9900 // : 330
x = 9900/330
x = 30
x = 30
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