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Simplifying 21 = -3x + 7(x + 7) Reorder the terms: 21 = -3x + 7(7 + x) 21 = -3x + (7 * 7 + x * 7) 21 = -3x + (49 + 7x) Reorder the terms: 21 = 49 + -3x + 7x Combine like terms: -3x + 7x = 4x 21 = 49 + 4x Solving 21 = 49 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 21 + -4x = 49 + 4x + -4x Combine like terms: 4x + -4x = 0 21 + -4x = 49 + 0 21 + -4x = 49 Add '-21' to each side of the equation. 21 + -21 + -4x = 49 + -21 Combine like terms: 21 + -21 = 0 0 + -4x = 49 + -21 -4x = 49 + -21 Combine like terms: 49 + -21 = 28 -4x = 28 Divide each side by '-4'. x = -7 Simplifying x = -7
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