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Simplifying 84 = x + (x + 4) + (x + 4 * 2) Reorder the terms: 84 = x + (4 + x) + (x + 4 * 2) Remove parenthesis around (4 + x) 84 = x + 4 + x + (x + 4 * 2) Multiply 4 * 2 84 = x + 4 + x + (x + 8) Reorder the terms: 84 = x + 4 + x + (8 + x) Remove parenthesis around (8 + x) 84 = x + 4 + x + 8 + x Reorder the terms: 84 = 4 + 8 + x + x + x Combine like terms: 4 + 8 = 12 84 = 12 + x + x + x Combine like terms: x + x = 2x 84 = 12 + 2x + x Combine like terms: 2x + x = 3x 84 = 12 + 3x Solving 84 = 12 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 84 + -3x = 12 + 3x + -3x Combine like terms: 3x + -3x = 0 84 + -3x = 12 + 0 84 + -3x = 12 Add '-84' to each side of the equation. 84 + -84 + -3x = 12 + -84 Combine like terms: 84 + -84 = 0 0 + -3x = 12 + -84 -3x = 12 + -84 Combine like terms: 12 + -84 = -72 -3x = -72 Divide each side by '-3'. x = 24 Simplifying x = 24
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