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Simplifying 120 = 3x + (x + 30) Reorder the terms: 120 = 3x + (30 + x) Remove parenthesis around (30 + x) 120 = 3x + 30 + x Reorder the terms: 120 = 30 + 3x + x Combine like terms: 3x + x = 4x 120 = 30 + 4x Solving 120 = 30 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 120 + -4x = 30 + 4x + -4x Combine like terms: 4x + -4x = 0 120 + -4x = 30 + 0 120 + -4x = 30 Add '-120' to each side of the equation. 120 + -120 + -4x = 30 + -120 Combine like terms: 120 + -120 = 0 0 + -4x = 30 + -120 -4x = 30 + -120 Combine like terms: 30 + -120 = -90 -4x = -90 Divide each side by '-4'. x = 22.5 Simplifying x = 22.5
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