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Simplifying 21 = 3x + -7(-2x + 14) Reorder the terms: 21 = 3x + -7(14 + -2x) 21 = 3x + (14 * -7 + -2x * -7) 21 = 3x + (-98 + 14x) Reorder the terms: 21 = -98 + 3x + 14x Combine like terms: 3x + 14x = 17x 21 = -98 + 17x Solving 21 = -98 + 17x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-17x' to each side of the equation. 21 + -17x = -98 + 17x + -17x Combine like terms: 17x + -17x = 0 21 + -17x = -98 + 0 21 + -17x = -98 Add '-21' to each side of the equation. 21 + -21 + -17x = -98 + -21 Combine like terms: 21 + -21 = 0 0 + -17x = -98 + -21 -17x = -98 + -21 Combine like terms: -98 + -21 = -119 -17x = -119 Divide each side by '-17'. x = 7 Simplifying x = 7
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