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Simplifying 9x + 15 = 7x + 21 Reorder the terms: 15 + 9x = 7x + 21 Reorder the terms: 15 + 9x = 21 + 7x Solving 15 + 9x = 21 + 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. 15 + 9x + -7x = 21 + 7x + -7x Combine like terms: 9x + -7x = 2x 15 + 2x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 15 + 2x = 21 + 0 15 + 2x = 21 Add '-15' to each side of the equation. 15 + -15 + 2x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 2x = 21 + -15 2x = 21 + -15 Combine like terms: 21 + -15 = 6 2x = 6 Divide each side by '2'. x = 3 Simplifying x = 3
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