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x in (-oo:+oo)
x/3 = (-2)^2 // - (-2)^2
x/3-(-2)^2 = 0
x/3-2^2 = 0
1/3*x-4 = 0 // + 4
1/3*x = 4 // : 1/3
x = 4/1/3
x = 12
x = 12
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