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Simplifying 72 + x = 5(4 + x) 72 + x = (4 * 5 + x * 5) 72 + x = (20 + 5x) Solving 72 + x = 20 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 72 + x + -5x = 20 + 5x + -5x Combine like terms: x + -5x = -4x 72 + -4x = 20 + 5x + -5x Combine like terms: 5x + -5x = 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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