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Simplifying 120 = 100 + -4(x + 20) Reorder the terms: 120 = 100 + -4(20 + x) 120 = 100 + (20 * -4 + x * -4) 120 = 100 + (-80 + -4x) Combine like terms: 100 + -80 = 20 120 = 20 + -4x Solving 120 = 20 + -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 = 20 + -4x + 4x Combine like terms: -4x + 4x = 0 120 + 4x = 20 + 0 120 + 4x = 20 Add '-120' to each side of the equation. 120 + -120 + 4x = 20 + -120 Combine like terms: 120 + -120 = 0 0 + 4x = 20 + -120 4x = 20 + -120 Combine like terms: 20 + -120 = -100 4x = -100 Divide each side by '4'. x = -25 Simplifying x = -25
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