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Simplifying (3x + 15) + (4x + 5) = 90 Reorder the terms: (15 + 3x) + (4x + 5) = 90 Remove parenthesis around (15 + 3x) 15 + 3x + (4x + 5) = 90 Reorder the terms: 15 + 3x + (5 + 4x) = 90 Remove parenthesis around (5 + 4x) 15 + 3x + 5 + 4x = 90 Reorder the terms: 15 + 5 + 3x + 4x = 90 Combine like terms: 15 + 5 = 20 20 + 3x + 4x = 90 Combine like terms: 3x + 4x = 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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