solve : 21x = 196 - x^2
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Step-by-step explanation:
x² + 21x - 196 = 0
x² + 28x - 7x - 196 = 0
x(x + 28) - 7(x + 28) = 0
(x + 28) (x - 7) = 0
x = -28 , 7
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