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Simplifying x + (x + 7) + [2(x + 7)] = 89 Reorder the terms: x + (7 + x) + [2(x + 7)] = 89 Remove parenthesis around (7 + x) x + 7 + x + [2(x + 7)] = 89 Reorder the terms: x + 7 + x + [2(7 + x)] = 89 x + 7 + x + [(7 * 2 + x * 2)] = 89 x + 7 + x + [(14 + 2x)] = 89 x + 7 + x + [14 + 2x] = 89 Remove brackets around [14 + 2x] x + 7 + x + 14 + 2x = 89 Reorder the terms: 7 + 14 + x + x + 2x = 89 Combine like terms: 7 + 14 = 21 21 + x + x + 2x = 89 Combine like terms: x + x = 2x 21 + 2x + 2x = 89 Combine like terms: 2x + 2x = 4x 21 + 4x = 89 Solving 21 + 4x = 89 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 4x = 89 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 89 + -21 4x = 89 + -21 Combine like terms: 89 + -21 = 68 4x = 68 Divide each side by '4'. x = 17 Simplifying x = 17
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