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no...no not quite, its 13, Here:3x2+7=x 3 times 2 equals 66+7=x 6 plus 7 equals 1313=x 13 equals xThere's yours answer, wasnt quite sure if it was a serious question or not but there ya go.
3x2= 6 6-(4x-2)= 6--8= 6+8 = 14 14+7 = 21
x=-.25.
3x2 = 21 describes two single values, and does not have an x intercept. 3x2 = 21 ∴ x2 = 7 ∴ x = ±√7
3x2 + 2x - 21 = (3x - 7) (x + 3)