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Simplifying 21 + -7x = 7(x + 7) Reorder the terms: 21 + -7x = 7(7 + x) 21 + -7x = (7 * 7 + x * 7) 21 + -7x = (49 + 7x) Solving 21 + -7x = 49 + 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 + -7x = 49 + 7x + -7x Combine like terms: -7x + -7x = -14x 21 + -14x = 49 + 7x + -7x Combine like terms: 7x + -7x = 0 21 + -14x = 49 + 0 21 + -14x = 49 Add '-21' to each side of the equation. 21 + -21 + -14x = 49 + -21 Combine like terms: 21 + -21 = 0 0 + -14x = 49 + -21 -14x = 49 + -21 Combine like terms: 49 + -21 = 28 -14x = 28 Divide each side by '-14'. x = -2 Simplifying x = -2
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