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Simplifying 450 + 15x = 300 + 20x Solving 450 + 15x = 300 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. 450 + 15x + -20x = 300 + 20x + -20x Combine like terms: 15x + -20x = -5x 450 + -5x = 300 + 20x + -20x Combine like terms: 20x + -20x = 0 450 + -5x = 300 + 0 450 + -5x = 300 Add '-450' to each side of the equation. 450 + -450 + -5x = 300 + -450 Combine like terms: 450 + -450 = 0 0 + -5x = 300 + -450 -5x = 300 + -450 Combine like terms: 300 + -450 = -150 -5x = -150 Divide each side by '-5'. x = 30 Simplifying x = 30
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