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Simplifying 9x + 21 = 2x + 112 Reorder the terms: 21 + 9x = 2x + 112 Reorder the terms: 21 + 9x = 112 + 2x Solving 21 + 9x = 112 + 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 = 112 + 2x + -2x Combine like terms: 9x + -2x = 7x 21 + 7x = 112 + 2x + -2x Combine like terms: 2x + -2x = 0 21 + 7x = 112 + 0 21 + 7x = 112 Add '-21' to each side of the equation. 21 + -21 + 7x = 112 + -21 Combine like terms: 21 + -21 = 0 0 + 7x = 112 + -21 7x = 112 + -21 Combine like terms: 112 + -21 = 91 7x = 91 Divide each side by '7'. x = 13 Simplifying x = 13
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