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Simplifying 3X + (X + 20) = 90 Reorder the terms: 3X + (20 + X) = 90 Remove parenthesis around (20 + X) 3X + 20 + X = 90 Reorder the terms: 20 + 3X + X = 90 Combine like terms: 3X + X = 4X 20 + 4X = 90 Solving 20 + 4X = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 4X = 90 + -20 Combine like terms: 20 + -20 = 0 0 + 4X = 90 + -20 4X = 90 + -20 Combine like terms: 90 + -20 = 70 4X = 70 Divide each side by '4'. X = 17.5 Simplifying X = 17.5
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