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Simplifying (2x) + (x + 42) = 90 Reorder the terms: (2x) + (42 + x) = 90 Remove parenthesis around (42 + x) (2x) + 42 + x = 90 Reorder the terms: 42 + (2x) + x = 90 Combine like terms: (2x) + x = 3x 42 + 3x = 90 Solving 42 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 3x = 90 + -42 Combine like terms: 42 + -42 = 0 0 + 3x = 90 + -42 3x = 90 + -42 Combine like terms: 90 + -42 = 48 3x = 48 Divide each side by '3'. x = 16 Simplifying x = 16
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