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Simplifying 21 = 7x + 3(x + 3) Reorder the terms: 21 = 7x + 3(3 + x) 21 = 7x + (3 * 3 + x * 3) 21 = 7x + (9 + 3x) Reorder the terms: 21 = 9 + 7x + 3x Combine like terms: 7x + 3x = 10x 21 = 9 + 10x Solving 21 = 9 + 10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10x' to each side of the equation. 21 + -10x = 9 + 10x + -10x Combine like terms: 10x + -10x = 0 21 + -10x = 9 + 0 21 + -10x = 9 Add '-21' to each side of the equation. 21 + -21 + -10x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -10x = 9 + -21 -10x = 9 + -21 Combine like terms: 9 + -21 = -12 -10x = -12 Divide each side by '-10'. x = 1.2 Simplifying x = 1.2
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