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Simplifying 21 + 24 = 3(7 + x) Combine like terms: 21 + 24 = 45 45 = 3(7 + x) 45 = (7 * 3 + x * 3) 45 = (21 + 3x) Solving 45 = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 45 + -3x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 45 + -3x = 21 + 0 45 + -3x = 21 Add '-45' to each side of the equation. 45 + -45 + -3x = 21 + -45 Combine like terms: 45 + -45 = 0 0 + -3x = 21 + -45 -3x = 21 + -45 Combine like terms: 21 + -45 = -24 -3x = -24 Divide each side by '-3'. x = 8 Simplifying x = 8
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