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Simplifying 7x + -21 = 21x + -7 Reorder the terms: -21 + 7x = 21x + -7 Reorder the terms: -21 + 7x = -7 + 21x Solving -21 + 7x = -7 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -21 + 7x + -21x = -7 + 21x + -21x Combine like terms: 7x + -21x = -14x -21 + -14x = -7 + 21x + -21x Combine like terms: 21x + -21x = 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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