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Simplifying 3x + (x + 8) = 90 Reorder the terms: 3x + (8 + x) = 90 Remove parenthesis around (8 + x) 3x + 8 + x = 90 Reorder the terms: 8 + 3x + x = 90 Combine like terms: 3x + x = 4x 8 + 4x = 90 Solving 8 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 4x = 90 + -8 Combine like terms: 8 + -8 = 0 0 + 4x = 90 + -8 4x = 90 + -8 Combine like terms: 90 + -8 = 82 4x = 82 Divide each side by '4'. x = 20.5 Simplifying x = 20.5
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