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Simplifying -21 + -5x = 5x + -3(7 + 8x) -21 + -5x = 5x + (7 * -3 + 8x * -3) -21 + -5x = 5x + (-21 + -24x) Reorder the terms: -21 + -5x = -21 + 5x + -24x Combine like terms: 5x + -24x = -19x -21 + -5x = -21 + -19x Add '21' to each side of the equation. -21 + 21 + -5x = -21 + 21 + -19x Combine like terms: -21 + 21 = 0 0 + -5x = -21 + 21 + -19x -5x = -21 + 21 + -19x Combine like terms: -21 + 21 = 0 -5x = 0 + -19x -5x = -19x Solving -5x = -19x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '19x' to each side of the equation. -5x + 19x = -19x + 19x Combine like terms: -5x + 19x = 14x 14x = -19x + 19x Combine like terms: -19x + 19x = 0 14x = 0 Divide each side by '14'. x = 0 Simplifying x = 0
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