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Simplifying X + (X + 3) + (X + 3 + 4) = 40 Reorder the terms: X + (3 + X) + (X + 3 + 4) = 40 Remove parenthesis around (3 + X) X + 3 + X + (X + 3 + 4) = 40 Reorder the terms: X + 3 + X + (3 + 4 + X) = 40 Combine like terms: 3 + 4 = 7 X + 3 + X + (7 + X) = 40 Remove parenthesis around (7 + X) X + 3 + X + 7 + X = 40 Reorder the terms: 3 + 7 + X + X + X = 40 Combine like terms: 3 + 7 = 10 10 + X + X + X = 40 Combine like terms: X + X = 2X 10 + 2X + X = 40 Combine like terms: 2X + X = 3X 10 + 3X = 40 Solving 10 + 3X = 40 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 3X = 40 + -10 Combine like terms: 10 + -10 = 0 0 + 3X = 40 + -10 3X = 40 + -10 Combine like terms: 40 + -10 = 30 3X = 30 Divide each side by '3'. X = 10 Simplifying X = 10
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