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Simplifying -3(x + 7) = 21 + -5x Reorder the terms: -3(7 + x) = 21 + -5x (7 * -3 + x * -3) = 21 + -5x (-21 + -3x) = 21 + -5x Solving -21 + -3x = 21 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. -21 + -3x + 5x = 21 + -5x + 5x Combine like terms: -3x + 5x = 2x -21 + 2x = 21 + -5x + 5x Combine like terms: -5x + 5x = 0 -21 + 2x = 21 + 0 -21 + 2x = 21 Add '21' to each side of the equation. -21 + 21 + 2x = 21 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 21 + 21 2x = 21 + 21 Combine like terms: 21 + 21 = 42 2x = 42 Divide each side by '2'. x = 21 Simplifying x = 21
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