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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 = 150 7x = 150 Divide each side by '7'. x = 21.42857143 Simplifying x = 21.42857143
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