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x in (-oo:+oo)
(48/2)*(x+12)+20*x = 0
24*(x+12)+20*x = 0
24*(x+12)+20*x = 0
44*x+288 = 0
44*x+288 = 0
44*x+288 = 0 // - 288
44*x = -288 // : 44
x = -288/44
x = -72/11
x = -72/11
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