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Simplifying 15 + 20x = 90 + -3x Solving 15 + 20x = 90 + -3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3x' to each side of the equation. 15 + 20x + 3x = 90 + -3x + 3x Combine like terms: 20x + 3x = 23x 15 + 23x = 90 + -3x + 3x Combine like terms: -3x + 3x = 0 15 + 23x = 90 + 0 15 + 23x = 90 Add '-15' to each side of the equation. 15 + -15 + 23x = 90 + -15 Combine like terms: 15 + -15 = 0 0 + 23x = 90 + -15 23x = 90 + -15 Combine like terms: 90 + -15 = 75 23x = 75 Divide each side by '23'. x = 3.260869565 Simplifying x = 3.260869565
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