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Simplifying x + (X + 1) + (x + 2) + (x + 3) = 143 Reorder the terms: x + (1 + X) + (x + 2) + (x + 3) = 143 Remove parenthesis around (1 + X) x + 1 + X + (x + 2) + (x + 3) = 143 Reorder the terms: x + 1 + X + (2 + x) + (x + 3) = 143 Remove parenthesis around (2 + x) x + 1 + X + 2 + x + (x + 3) = 143 Reorder the terms: x + 1 + X + 2 + x + (3 + x) = 143 Remove parenthesis around (3 + x) x + 1 + X + 2 + x + 3 + x = 143 Reorder the terms: 1 + 2 + 3 + X + x + x + x = 143 Combine like terms: 1 + 2 = 3 3 + 3 + X + x + x + x = 143 Combine like terms: 3 + 3 = 6 6 + X + x + x + x = 143 Combine like terms: x + x = 2x 6 + X + 2x + x = 143 Combine like terms: 2x + x = 3x 6 + X + 3x = 143 Solving 6 + X + 3x = 143 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + X + -6 + 3x = 143 + -6 Reorder the terms: 6 + -6 + X + 3x = 143 + -6 Combine like terms: 6 + -6 = 0 0 + X + 3x = 143 + -6 X + 3x = 143 + -6 Combine like terms: 143 + -6 = 137 X + 3x = 137 Add '-3x' to each side of the equation. X + 3x + -3x = 137 + -3x Combine like terms: 3x + -3x = 0 X + 0 = 137 + -3x X = 137 + -3x Simplifying X = 137 + -3x
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