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Simplifying x + (x + 3) + (x + 7) = 40 Reorder the terms: x + (3 + x) + (x + 7) = 40 Remove parenthesis around (3 + x) x + 3 + x + (x + 7) = 40 Reorder the terms: 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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