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49-((6*x^2)/3) = 0
49-2*x^2 = 0
-2*x^2 = -49 // : -2
x^2 = 49/2
x^2 = 49/2 // ^ 1/2
abs(x) = (49/2)^(1/2)
x = (49/2)^(1/2) or x = -(49/2)^(1/2)
x in { (49/2)^(1/2), -(49/2)^(1/2) }
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