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Simplifying 21 + 9x = 2x + -7 Reorder the terms: 21 + 9x = -7 + 2x Solving 21 + 9x = -7 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 21 + 9x + -2x = -7 + 2x + -2x Combine like terms: 9x + -2x = 7x 21 + 7x = -7 + 2x + -2x Combine like terms: 2x + -2x = 0 21 + 7x = -7 + 0 21 + 7x = -7 Add '-21' to each side of the equation. 21 + -21 + 7x = -7 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = -7 + -21 7x = -7 + -21 Combine like terms: -7 + -21 = -28 7x = -28 Divide each side by '7'. x = -4 Simplifying x = -4
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