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x in (-oo:+oo)
2*x+(4/3)^2 = 240 // - 240
2*x+(4/3)^2-240 = 0
2*x-2144/9 = 0 // + 2144/9
2*x = 2144/9 // : 2
x = 2144/9/2
x = 1072/9
x = 1072/9
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