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Simplifying 21 = -7(5x + 7) Reorder the terms: 21 = -7(7 + 5x) 21 = (7 * -7 + 5x * -7) 21 = (-49 + -35x) Solving 21 = -49 + -35x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '35x' to each side of the equation. 21 + 35x = -49 + -35x + 35x Combine like terms: -35x + 35x = 0 21 + 35x = -49 + 0 21 + 35x = -49 Add '-21' to each side of the equation. 21 + -21 + 35x = -49 + -21 Combine like terms: 21 + -21 = 0 0 + 35x = -49 + -21 35x = -49 + -21 Combine like terms: -49 + -21 = -70 35x = -70 Divide each side by '35'. x = -2 Simplifying x = -2
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