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Simplifying (x) + (x + 2) + (x + 4) = 90 x + (x + 2) + (x + 4) = 90 Reorder the terms: x + (2 + x) + (x + 4) = 90 Remove parenthesis around (2 + x) x + 2 + x + (x + 4) = 90 Reorder the terms: x + 2 + x + (4 + x) = 90 Remove parenthesis around (4 + x) x + 2 + x + 4 + x = 90 Reorder the terms: 2 + 4 + x + x + x = 90 Combine like terms: 2 + 4 = 6 6 + x + x + x = 90 Combine like terms: x + x = 2x 6 + 2x + x = 90 Combine like terms: 2x + x = 3x 6 + 3x = 90 Solving 6 + 3x = 90 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 + -6 + 3x = 90 + -6 Combine like terms: 6 + -6 = 0 0 + 3x = 90 + -6 3x = 90 + -6 Combine like terms: 90 + -6 = 84 3x = 84 Divide each side by '3'. x = 28 Simplifying x = 28
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