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Simplifying (2x + 41) + (5x + -21) = 90 Reorder the terms: (41 + 2x) + (5x + -21) = 90 Remove parenthesis around (41 + 2x) 41 + 2x + (5x + -21) = 90 Reorder the terms: 41 + 2x + (-21 + 5x) = 90 Remove parenthesis around (-21 + 5x) 41 + 2x + -21 + 5x = 90 Reorder the terms: 41 + -21 + 2x + 5x = 90 Combine like terms: 41 + -21 = 20 20 + 2x + 5x = 90 Combine like terms: 2x + 5x = 7x 20 + 7x = 90 Solving 20 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 7x = 90 + -20 Combine like terms: 20 + -20 = 0 0 + 7x = 90 + -20 7x = 90 + -20 Combine like terms: 90 + -20 = 70 7x = 70 Divide each side by '7'. x = 10 Simplifying x = 10
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