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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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