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Simplifying x + 21 = 3x + -15 Reorder the terms: 21 + x = 3x + -15 Reorder the terms: 21 + x = -15 + 3x Solving 21 + x = -15 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 21 + x + -3x = -15 + 3x + -3x Combine like terms: x + -3x = -2x 21 + -2x = -15 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -2x = -15 + 0 21 + -2x = -15 Add '-21' to each side of the equation. 21 + -21 + -2x = -15 + -21 Combine like terms: 21 + -21 = 0 0 + -2x = -15 + -21 -2x = -15 + -21 Combine like terms: -15 + -21 = -36 -2x = -36 Divide each side by '-2'. x = 18 Simplifying x = 18
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