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Simplifying (10x + 21) + (13x) = 90 Reorder the terms: (21 + 10x) + (13x) = 90 Remove parenthesis around (21 + 10x) 21 + 10x + (13x) = 90 Combine like terms: 10x + (13x) = 23x 21 + 23x = 90 Solving 21 + 23x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 23x = 90 + -21 Combine like terms: 21 + -21 = 0 0 + 23x = 90 + -21 23x = 90 + -21 Combine like terms: 90 + -21 = 69 23x = 69 Divide each side by '23'. x = 3 Simplifying x = 3
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