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Simplifying 21 = 3x + 5(-2x + 14) Reorder the terms: 21 = 3x + 5(14 + -2x) 21 = 3x + (14 * 5 + -2x * 5) 21 = 3x + (70 + -10x) Reorder the terms: 21 = 70 + 3x + -10x Combine like terms: 3x + -10x = -7x 21 = 70 + -7x Solving 21 = 70 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 21 + 7x = 70 + -7x + 7x Combine like terms: -7x + 7x = 0 21 + 7x = 70 + 0 21 + 7x = 70 Add '-21' to each side of the equation. 21 + -21 + 7x = 70 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = 70 + -21 7x = 70 + -21 Combine like terms: 70 + -21 = 49 7x = 49 Divide each side by '7'. x = 7 Simplifying x = 7
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