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Simplifying x + 3x + (3x + 30) = 120 Reorder the terms: x + 3x + (30 + 3x) = 120 Remove parenthesis around (30 + 3x) x + 3x + 30 + 3x = 120 Reorder the terms: 30 + x + 3x + 3x = 120 Combine like terms: x + 3x = 4x 30 + 4x + 3x = 120 Combine like terms: 4x + 3x = 7x 30 + 7x = 120 Solving 30 + 7x = 120 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 = 120 + -30 Combine like terms: 30 + -30 = 0 0 + 7x = 120 + -30 7x = 120 + -30 Combine like terms: 120 + -30 = 90 7x = 90 Divide each side by '7'. x = 12.85714286 Simplifying x = 12.85714286
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