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Simplifying 21 = 7x + 5(x + 5) Reorder the terms: 21 = 7x + 5(5 + x) 21 = 7x + (5 * 5 + x * 5) 21 = 7x + (25 + 5x) Reorder the terms: 21 = 25 + 7x + 5x Combine like terms: 7x + 5x = 12x 21 = 25 + 12x Solving 21 = 25 + 12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12x' to each side of the equation. 21 + -12x = 25 + 12x + -12x Combine like terms: 12x + -12x = 0 21 + -12x = 25 + 0 21 + -12x = 25 Add '-21' to each side of the equation. 21 + -21 + -12x = 25 + -21 Combine like terms: 21 + -21 = 0 0 + -12x = 25 + -21 -12x = 25 + -21 Combine like terms: 25 + -21 = 4 -12x = 4 Divide each side by '-12'. x = -0.3333333333 Simplifying x = -0.3333333333
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