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Simplifying Xsquared + -4x + -21 = 0 Reorder the terms: -21 + adeqrsuX + -4x = 0 Solving -21 + adeqrsuX + -4x = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + adeqrsuX + 21 + -4x = 0 + 21 Reorder the terms: -21 + 21 + adeqrsuX + -4x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + adeqrsuX + -4x = 0 + 21 adeqrsuX + -4x = 0 + 21 Combine like terms: 0 + 21 = 21 adeqrsuX + -4x = 21 Add '4x' to each side of the equation. adeqrsuX + -4x + 4x = 21 + 4x Combine like terms: -4x + 4x = 0 adeqrsuX + 0 = 21 + 4x adeqrsuX = 21 + 4x Divide each side by 'deqrsuX'. a = 21d-1e-1q-1r-1s-1u-1X-1 + 4d-1e-1q-1r-1s-1u-1xX-1 Simplifying a = 21d-1e-1q-1r-1s-1u-1X-1 + 4d-1e-1q-1r-1s-1u-1xX-1
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