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Simplifying 21 + 8x = 7(3 + -4x) 21 + 8x = (3 * 7 + -4x * 7) 21 + 8x = (21 + -28x) Add '-21' to each side of the equation. 21 + -21 + 8x = 21 + -21 + -28x Combine like terms: 21 + -21 = 0 0 + 8x = 21 + -21 + -28x 8x = 21 + -21 + -28x Combine like terms: 21 + -21 = 0 8x = 0 + -28x 8x = -28x Solving 8x = -28x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28x' to each side of the equation. 8x + 28x = -28x + 28x Combine like terms: 8x + 28x = 36x 36x = -28x + 28x Combine like terms: -28x + 28x = 0 36x = 0 Divide each side by '36'. x = 0 Simplifying x = 0
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