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Simplifying 5x + -15 = x + 21 Reorder the terms: -15 + 5x = x + 21 Reorder the terms: -15 + 5x = 21 + x Solving -15 + 5x = 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 + 5x + -1x = 21 + x + -1x Combine like terms: 5x + -1x = 4x -15 + 4x = 21 + x + -1x Combine like terms: x + -1x = 0 -15 + 4x = 21 + 0 -15 + 4x = 21 Add '15' to each side of the equation. -15 + 15 + 4x = 21 + 15 Combine like terms: -15 + 15 = 0 0 + 4x = 21 + 15 4x = 21 + 15 Combine like terms: 21 + 15 = 36 4x = 36 Divide each side by '4'. x = 9 Simplifying x = 9
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