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Simplifying 3(x + -5) = x + -21 Reorder the terms: 3(-5 + x) = x + -21 (-5 * 3 + x * 3) = x + -21 (-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 = -6 2x = -6 Divide each side by '2'. x = -3 Simplifying x = -3
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