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Simplifying 7(3)(x + 2) = 21(7) Reorder the terms: 7 * 3(2 + x) = 21(7) Multiply 7 * 3 21(2 + x) = 21(7) (2 * 21 + x * 21) = 21(7) (42 + 21x) = 21(7) Multiply 21 * 7 42 + 21x = 147 Solving 42 + 21x = 147 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 21x = 147 + -42 Combine like terms: 42 + -42 = 0 0 + 21x = 147 + -42 21x = 147 + -42 Combine like terms: 147 + -42 = 105 21x = 105 Divide each side by '21'. x = 5 Simplifying x = 5
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