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x in (-oo:+oo)
x-((1/3)*x)-((1/4)*x) = 150000 // - 150000
x-((1/3)*x)-((1/4)*x)-150000 = 0
x+(-1/3)*x+(-1/4)*x-150000 = 0
5/12*x-150000 = 0 // + 150000
5/12*x = 150000 // : 5/12
x = 150000/5/12
x = 360000
x = 360000
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