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Simplifying (3x + 42) + 3x = 90 Reorder the terms: (42 + 3x) + 3x = 90 Remove parenthesis around (42 + 3x) 42 + 3x + 3x = 90 Combine like terms: 3x + 3x = 6x 42 + 6x = 90 Solving 42 + 6x = 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 + 6x = 90 + -42 Combine like terms: 42 + -42 = 0 0 + 6x = 90 + -42 6x = 90 + -42 Combine like terms: 90 + -42 = 48 6x = 48 Divide each side by '6'. x = 8 Simplifying x = 8
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