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Simplifying 80 + 20x = 90 + 18x Solving 80 + 20x = 90 + 18x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18x' to each side of the equation. 80 + 20x + -18x = 90 + 18x + -18x Combine like terms: 20x + -18x = 2x 80 + 2x = 90 + 18x + -18x Combine like terms: 18x + -18x = 0 80 + 2x = 90 + 0 80 + 2x = 90 Add '-80' to each side of the equation. 80 + -80 + 2x = 90 + -80 Combine like terms: 80 + -80 = 0 0 + 2x = 90 + -80 2x = 90 + -80 Combine like terms: 90 + -80 = 10 2x = 10 Divide each side by '2'. x = 5 Simplifying x = 5
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