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Simplifying -21 + 5x = -7x + 72 Reorder the terms: -21 + 5x = 72 + -7x Solving -21 + 5x = 72 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. -21 + 5x + 7x = 72 + -7x + 7x Combine like terms: 5x + 7x = 12x -21 + 12x = 72 + -7x + 7x Combine like terms: -7x + 7x = 0 -21 + 12x = 72 + 0 -21 + 12x = 72 Add '21' to each side of the equation. -21 + 21 + 12x = 72 + 21 Combine like terms: -21 + 21 = 0 0 + 12x = 72 + 21 12x = 72 + 21 Combine like terms: 72 + 21 = 93 12x = 93 Divide each side by '12'. x = 7.75 Simplifying x = 7.75
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