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Simplifying 21x + 1 + 22x + -2 = 90 Reorder the terms: 1 + -2 + 21x + 22x = 90 Combine like terms: 1 + -2 = -1 -1 + 21x + 22x = 90 Combine like terms: 21x + 22x = 43x -1 + 43x = 90 Solving -1 + 43x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 43x = 90 + 1 Combine like terms: -1 + 1 = 0 0 + 43x = 90 + 1 43x = 90 + 1 Combine like terms: 90 + 1 = 91 43x = 91 Divide each side by '43'. x = 2.11627907 Simplifying x = 2.11627907
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