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Simplifying 3x + 15 = 5x + 7 Reorder the terms: 15 + 3x = 5x + 7 Reorder the terms: 15 + 3x = 7 + 5x Solving 15 + 3x = 7 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 15 + 3x + -5x = 7 + 5x + -5x Combine like terms: 3x + -5x = -2x 15 + -2x = 7 + 5x + -5x Combine like terms: 5x + -5x = 0 15 + -2x = 7 + 0 15 + -2x = 7 Add '-15' to each side of the equation. 15 + -15 + -2x = 7 + -15 Combine like terms: 15 + -15 = 0 0 + -2x = 7 + -15 -2x = 7 + -15 Combine like terms: 7 + -15 = -8 -2x = -8 Divide each side by '-2'. x = 4 Simplifying x = 4
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