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x in (-oo:+oo)
x+(4*x)/10 = 150 // - 150
x+(4*x)/10-150 = 0
7/5*x-150 = 0 // + 150
7/5*x = 150 // : 7/5
x = 150/7/5
x = 750/7
x = 750/7
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