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Simplifying 90 + -7x = 20x + 15 Reorder the terms: 90 + -7x = 15 + 20x Solving 90 + -7x = 15 + 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. 90 + -7x + -20x = 15 + 20x + -20x Combine like terms: -7x + -20x = -27x 90 + -27x = 15 + 20x + -20x Combine like terms: 20x + -20x = 0 90 + -27x = 15 + 0 90 + -27x = 15 Add '-90' to each side of the equation. 90 + -90 + -27x = 15 + -90 Combine like terms: 90 + -90 = 0 0 + -27x = 15 + -90 -27x = 15 + -90 Combine like terms: 15 + -90 = -75 -27x = -75 Divide each side by '-27'. x = 2.777777778 Simplifying x = 2.777777778
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