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Simplifying 90 = (5x + 20) Reorder the terms: 90 = (20 + 5x) Remove parenthesis around (20 + 5x) 90 = 20 + 5x Solving 90 = 20 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 90 + -5x = 20 + 5x + -5x Combine like terms: 5x + -5x = 0 90 + -5x = 20 + 0 90 + -5x = 20 Add '-90' to each side of the equation. 90 + -90 + -5x = 20 + -90 Combine like terms: 90 + -90 = 0 0 + -5x = 20 + -90 -5x = 20 + -90 Combine like terms: 20 + -90 = -70 -5x = -70 Divide each side by '-5'. x = 14 Simplifying x = 14
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