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Simplifying (3x + 21) + (4x + 9) = 180 Reorder the terms: (21 + 3x) + (4x + 9) = 180 Remove parenthesis around (21 + 3x) 21 + 3x + (4x + 9) = 180 Reorder the terms: 21 + 3x + (9 + 4x) = 180 Remove parenthesis around (9 + 4x) 21 + 3x + 9 + 4x = 180 Reorder the terms: 21 + 9 + 3x + 4x = 180 Combine like terms: 21 + 9 = 30 30 + 3x + 4x = 180 Combine like terms: 3x + 4x = 7x 30 + 7x = 180 Solving 30 + 7x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 7x = 180 + -30 Combine like terms: 30 + -30 = 0 0 + 7x = 180 + -30 7x = 180 + -30 Combine like terms: 180 + -30 = 150 7x = 150 Divide each side by '7'. x = 21.42857143 Simplifying x = 21.42857143
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