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X in (-oo:+oo)
X/3 = 7^2-2 // - 7^2-2
X/3-7^2+2 = 0
1/3*X-47 = 0 // + 47
1/3*X = 47 // : 1/3
X = 47/1/3
X = 141
X = 141
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