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Simplifying 3x + 15 = 21 + -1x Reorder the terms: 15 + 3x = 21 + -1x Solving 15 + 3x = 21 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 15 + 3x + x = 21 + -1x + x Combine like terms: 3x + x = 4x 15 + 4x = 21 + -1x + x Combine like terms: -1x + x = 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 = 6 4x = 6 Divide each side by '4'. x = 1.5 Simplifying x = 1.5
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