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Simplifying -1x + -21 = 3(x + 5) Reorder the terms: -21 + -1x = 3(x + 5) Reorder the terms: -21 + -1x = 3(5 + x) -21 + -1x = (5 * 3 + x * 3) -21 + -1x = (15 + 3x) Solving -21 + -1x = 15 + 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 + -1x + -3x = 15 + 3x + -3x Combine like terms: -1x + -3x = -4x -21 + -4x = 15 + 3x + -3x Combine like terms: 3x + -3x = 0 -21 + -4x = 15 + 0 -21 + -4x = 15 Add '21' to each side of the equation. -21 + 21 + -4x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + -4x = 15 + 21 -4x = 15 + 21 Combine like terms: 15 + 21 = 36 -4x = 36 Divide each side by '-4'. x = -9 Simplifying x = -9
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