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Simplifying 72 + -5x = 4x + 21 Reorder the terms: 72 + -5x = 21 + 4x Solving 72 + -5x = 21 + 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 + -5x + -4x = 21 + 4x + -4x Combine like terms: -5x + -4x = -9x 72 + -9x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 72 + -9x = 21 + 0 72 + -9x = 21 Add '-72' to each side of the equation. 72 + -72 + -9x = 21 + -72 Combine like terms: 72 + -72 = 0 0 + -9x = 21 + -72 -9x = 21 + -72 Combine like terms: 21 + -72 = -51 -9x = -51 Divide each side by '-9'. x = 5.666666667 Simplifying x = 5.666666667
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