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Simplifying 3x + -15 = x + 21 Reorder the terms: -15 + 3x = x + 21 Reorder the terms: -15 + 3x = 21 + x Solving -15 + 3x = 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 + 3x + -1x = 21 + x + -1x Combine like terms: 3x + -1x = 2x -15 + 2x = 21 + x + -1x Combine like terms: x + -1x = 0 -15 + 2x = 21 + 0 -15 + 2x = 21 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 = 36 2x = 36 Divide each side by '2'. x = 18 Simplifying x = 18
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