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Simplifying 2x + -15 = x + -21 Reorder the terms: -15 + 2x = x + -21 Reorder the terms: -15 + 2x = -21 + x Solving -15 + 2x = -21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -15 + 2x + -1x = -21 + x + -1x Combine like terms: 2x + -1x = 1x -15 + 1x = -21 + x + -1x Combine like terms: x + -1x = 0 -15 + 1x = -21 + 0 -15 + 1x = -21 Add '15' to each side of the equation. -15 + 15 + 1x = -21 + 15 Combine like terms: -15 + 15 = 0 0 + 1x = -21 + 15 1x = -21 + 15 Combine like terms: -21 + 15 = -6 1x = -6 Divide each side by '1'. x = -6 Simplifying x = -6
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