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Simplifying 3x + (x + 18) = 90 Reorder the terms: 3x + (18 + x) = 90 Remove parenthesis around (18 + x) 3x + 18 + x = 90 Reorder the terms: 18 + 3x + x = 90 Combine like terms: 3x + x = 4x 18 + 4x = 90 Solving 18 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 4x = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 4x = 90 + -18 4x = 90 + -18 Combine like terms: 90 + -18 = 72 4x = 72 Divide each side by '4'. x = 18 Simplifying x = 18
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