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x in (-oo:+oo)
x+x/3+15 = 150 // - 150
x+x/3-150+15 = 0
4/3*x-135 = 0 // + 135
4/3*x = 135 // : 4/3
x = 135/4/3
x = 405/4
x = 405/4
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