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Simplifying x + (x + -3) + (x + 4) = 40 Reorder the terms: x + (-3 + x) + (x + 4) = 40 Remove parenthesis around (-3 + x) x + -3 + x + (x + 4) = 40 Reorder the terms: x + -3 + x + (4 + x) = 40 Remove parenthesis around (4 + x) x + -3 + x + 4 + x = 40 Reorder the terms: -3 + 4 + x + x + x = 40 Combine like terms: -3 + 4 = 1 1 + x + x + x = 40 Combine like terms: x + x = 2x 1 + 2x + x = 40 Combine like terms: 2x + x = 3x 1 + 3x = 40 Solving 1 + 3x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 3x = 40 + -1 Combine like terms: 1 + -1 = 0 0 + 3x = 40 + -1 3x = 40 + -1 Combine like terms: 40 + -1 = 39 3x = 39 Divide each side by '3'. x = 13 Simplifying x = 13
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