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Simplifying 7x + 9 = 15x + -15 Reorder the terms: 9 + 7x = 15x + -15 Reorder the terms: 9 + 7x = -15 + 15x Solving 9 + 7x = -15 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 9 + 7x + -15x = -15 + 15x + -15x Combine like terms: 7x + -15x = -8x 9 + -8x = -15 + 15x + -15x Combine like terms: 15x + -15x = 0 9 + -8x = -15 + 0 9 + -8x = -15 Add '-9' to each side of the equation. 9 + -9 + -8x = -15 + -9 Combine like terms: 9 + -9 = 0 0 + -8x = -15 + -9 -8x = -15 + -9 Combine like terms: -15 + -9 = -24 -8x = -24 Divide each side by '-8'. x = 3 Simplifying x = 3
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