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Simplifying x + x + (x + 5) + (x + 7) = 40 Reorder the terms: x + x + (5 + x) + (x + 7) = 40 Remove parenthesis around (5 + x) x + x + 5 + x + (x + 7) = 40 Reorder the terms: x + x + 5 + x + (7 + x) = 40 Remove parenthesis around (7 + x) x + x + 5 + x + 7 + x = 40 Reorder the terms: 5 + 7 + x + x + x + x = 40 Combine like terms: 5 + 7 = 12 12 + x + x + x + x = 40 Combine like terms: x + x = 2x 12 + 2x + x + x = 40 Combine like terms: 2x + x = 3x 12 + 3x + x = 40 Combine like terms: 3x + x = 4x 12 + 4x = 40 Solving 12 + 4x = 40 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 + 4x = 40 + -12 Combine like terms: 12 + -12 = 0 0 + 4x = 40 + -12 4x = 40 + -12 Combine like terms: 40 + -12 = 28 4x = 28 Divide each side by '4'. x = 7 Simplifying x = 7
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