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Simplifying (3x + 4) + (4x + 2) = 90 Reorder the terms: (4 + 3x) + (4x + 2) = 90 Remove parenthesis around (4 + 3x) 4 + 3x + (4x + 2) = 90 Reorder the terms: 4 + 3x + (2 + 4x) = 90 Remove parenthesis around (2 + 4x) 4 + 3x + 2 + 4x = 90 Reorder the terms: 4 + 2 + 3x + 4x = 90 Combine like terms: 4 + 2 = 6 6 + 3x + 4x = 90 Combine like terms: 3x + 4x = 7x 6 + 7x = 90 Solving 6 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 7x = 90 + -6 Combine like terms: 6 + -6 = 0 0 + 7x = 90 + -6 7x = 90 + -6 Combine like terms: 90 + -6 = 84 7x = 84 Divide each side by '7'. x = 12 Simplifying x = 12
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