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Simplifying 3x + -5x + 15 = 21 Reorder the terms: 15 + 3x + -5x = 21 Combine like terms: 3x + -5x = -2x 15 + -2x = 21 Solving 15 + -2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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