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Simplifying 90 = 4x + 22 + 5x + 23 Reorder the terms: 90 = 22 + 23 + 4x + 5x Combine like terms: 22 + 23 = 45 90 = 45 + 4x + 5x Combine like terms: 4x + 5x = 9x 90 = 45 + 9x Solving 90 = 45 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 90 + -9x = 45 + 9x + -9x Combine like terms: 9x + -9x = 0 90 + -9x = 45 + 0 90 + -9x = 45 Add '-90' to each side of the equation. 90 + -90 + -9x = 45 + -90 Combine like terms: 90 + -90 = 0 0 + -9x = 45 + -90 -9x = 45 + -90 Combine like terms: 45 + -90 = -45 -9x = -45 Divide each side by '-9'. x = 5 Simplifying x = 5
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