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Simplifying (7x + 4) + (3x + 9) = 133 Reorder the terms: (4 + 7x) + (3x + 9) = 133 Remove parenthesis around (4 + 7x) 4 + 7x + (3x + 9) = 133 Reorder the terms: 4 + 7x + (9 + 3x) = 133 Remove parenthesis around (9 + 3x) 4 + 7x + 9 + 3x = 133 Reorder the terms: 4 + 9 + 7x + 3x = 133 Combine like terms: 4 + 9 = 13 13 + 7x + 3x = 133 Combine like terms: 7x + 3x = 10x 13 + 10x = 133 Solving 13 + 10x = 133 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 10x = 133 + -13 Combine like terms: 13 + -13 = 0 0 + 10x = 133 + -13 10x = 133 + -13 Combine like terms: 133 + -13 = 120 10x = 120 Divide each side by '10'. x = 12 Simplifying x = 12
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