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Simplifying 120 + -3x = 4x + 15 Reorder the terms: 120 + -3x = 15 + 4x Solving 120 + -3x = 15 + 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 + -3x + -4x = 15 + 4x + -4x Combine like terms: -3x + -4x = -7x 120 + -7x = 15 + 4x + -4x Combine like terms: 4x + -4x = 0 120 + -7x = 15 + 0 120 + -7x = 15 Add '-120' to each side of the equation. 120 + -120 + -7x = 15 + -120 Combine like terms: 120 + -120 = 0 0 + -7x = 15 + -120 -7x = 15 + -120 Combine like terms: 15 + -120 = -105 -7x = -105 Divide each side by '-7'. x = 15 Simplifying x = 15
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