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Simplifying 7(8 + -3x) = 21x + -49 (8 * 7 + -3x * 7) = 21x + -49 (56 + -21x) = 21x + -49 Reorder the terms: 56 + -21x = -49 + 21x Solving 56 + -21x = -49 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. 56 + -21x + -21x = -49 + 21x + -21x Combine like terms: -21x + -21x = -42x 56 + -42x = -49 + 21x + -21x Combine like terms: 21x + -21x = 0 56 + -42x = -49 + 0 56 + -42x = -49 Add '-56' to each side of the equation. 56 + -56 + -42x = -49 + -56 Combine like terms: 56 + -56 = 0 0 + -42x = -49 + -56 -42x = -49 + -56 Combine like terms: -49 + -56 = -105 -42x = -105 Divide each side by '-42'. x = 2.5 Simplifying x = 2.5
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