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Simplifying 4(x) + 4(x + 3) = 84 Reorder the terms: 4x + 4(3 + x) = 84 4x + (3 * 4 + x * 4) = 84 4x + (12 + 4x) = 84 Reorder the terms: 12 + 4x + 4x = 84 Combine like terms: 4x + 4x = 8x 12 + 8x = 84 Solving 12 + 8x = 84 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 8x = 84 + -12 Combine like terms: 12 + -12 = 0 0 + 8x = 84 + -12 8x = 84 + -12 Combine like terms: 84 + -12 = 72 8x = 72 Divide each side by '8'. x = 9 Simplifying x = 9
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