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Simplifying -3(x + 5) = -21 + -1x Reorder the terms: -3(5 + x) = -21 + -1x (5 * -3 + x * -3) = -21 + -1x (-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 = -2x -15 + -2x = -21 + -1x + x Combine like terms: -1x + x = 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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