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Simplifying x + x + (7 + x) + (7 + x) = 90 Remove parenthesis around (7 + x) x + x + 7 + x + (7 + x) = 90 Remove parenthesis around (7 + x) x + x + 7 + x + 7 + x = 90 Reorder the terms: 7 + 7 + x + x + x + x = 90 Combine like terms: 7 + 7 = 14 14 + x + x + x + x = 90 Combine like terms: x + x = 2x 14 + 2x + x + x = 90 Combine like terms: 2x + x = 3x 14 + 3x + x = 90 Combine like terms: 3x + x = 4x 14 + 4x = 90 Solving 14 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + 4x = 90 + -14 Combine like terms: 14 + -14 = 0 0 + 4x = 90 + -14 4x = 90 + -14 Combine like terms: 90 + -14 = 76 4x = 76 Divide each side by '4'. x = 19 Simplifying x = 19
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