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Simplifying -21 + 15 = -3x + 5x Combine like terms: -21 + 15 = -6 -6 = -3x + 5x Combine like terms: -3x + 5x = 2x -6 = 2x Solving -6 = 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. -6 + -2x = 2x + -2x Combine like terms: 2x + -2x = 0 -6 + -2x = 0 Add '6' to each side of the equation. -6 + 6 + -2x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -2x = 0 + 6 -2x = 0 + 6 Combine like terms: 0 + 6 = 6 -2x = 6 Divide each side by '-2'. x = -3 Simplifying x = -3
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