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Simplifying 21 = 14x + -1(-7) Multiply -1 * -7 21 = 14x + 7 Reorder the terms: 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 = -14 -14x = -14 Divide each side by '-14'. x = 1 Simplifying x = 1
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