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Simplifying 21 = 7(2x + -1) Reorder the terms: 21 = 7(-1 + 2x) 21 = (-1 * 7 + 2x * 7) 21 = (-7 + 14x) Solving 21 = -7 + 14x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14x' to each side of the equation. 21 + -14x = -7 + 14x + -14x Combine like terms: 14x + -14x = 0 21 + -14x = -7 + 0 21 + -14x = -7 Add '-21' to each side of the equation. 21 + -21 + -14x = -7 + -21 Combine like terms: 21 + -21 = 0 0 + -14x = -7 + -21 -14x = -7 + -21 Combine like terms: -7 + -21 = -28 -14x = -28 Divide each side by '-14'. x = 2 Simplifying x = 2
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