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Simplifying 21 + -5x = 3(x + -1) Reorder the terms: 21 + -5x = 3(-1 + x) 21 + -5x = (-1 * 3 + x * 3) 21 + -5x = (-3 + 3x) Solving 21 + -5x = -3 + 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 + -5x + -3x = -3 + 3x + -3x Combine like terms: -5x + -3x = -8x 21 + -8x = -3 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + -8x = -3 + 0 21 + -8x = -3 Add '-21' to each side of the equation. 21 + -21 + -8x = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -8x = -3 + -21 -8x = -3 + -21 Combine like terms: -3 + -21 = -24 -8x = -24 Divide each side by '-8'. x = 3 Simplifying x = 3
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