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Simplifying 72 = 20 + -4x Solving 72 = 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. 72 + 4x = 20 + -4x + 4x Combine like terms: -4x + 4x = 0 72 + 4x = 20 + 0 72 + 4x = 20 Add '-72' to each side of the equation. 72 + -72 + 4x = 20 + -72 Combine like terms: 72 + -72 = 0 0 + 4x = 20 + -72 4x = 20 + -72 Combine like terms: 20 + -72 = -52 4x = -52 Divide each side by '4'. x = -13 Simplifying x = -13
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