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Simplifying 7x2 + -21x + -7x2 + 63 = 0 Reorder the terms: 63 + -21x + 7x2 + -7x2 = 0 Combine like terms: 7x2 + -7x2 = 0 63 + -21x + 0 = 0 63 + -21x = 0 Solving 63 + -21x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63' to each side of the equation. 63 + -63 + -21x = 0 + -63 Combine like terms: 63 + -63 = 0 0 + -21x = 0 + -63 -21x = 0 + -63 Combine like terms: 0 + -63 = -63 -21x = -63 Divide each side by '-21'. x = 3 Simplifying x = 3
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