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Simplifying 21 + -4x = 3(7 + -8x) 21 + -4x = (7 * 3 + -8x * 3) 21 + -4x = (21 + -24x) Add '-21' to each side of the equation. 21 + -21 + -4x = 21 + -21 + -24x Combine like terms: 21 + -21 = 0 0 + -4x = 21 + -21 + -24x -4x = 21 + -21 + -24x Combine like terms: 21 + -21 = 0 -4x = 0 + -24x -4x = -24x Solving -4x = -24x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '24x' to each side of the equation. -4x + 24x = -24x + 24x Combine like terms: -4x + 24x = 20x 20x = -24x + 24x Combine like terms: -24x + 24x = 0 20x = 0 Divide each side by '20'. x = 0.0 Simplifying x = 0.0
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