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Simplifying 2x * 21 = 28(x + 5) Reorder the terms for easier multiplication: 2 * 21x = 28(x + 5) Multiply 2 * 21 42x = 28(x + 5) Reorder the terms: 42x = 28(5 + x) 42x = (5 * 28 + x * 28) 42x = (140 + 28x) Solving 42x = 140 + 28x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28x' to each side of the equation. 42x + -28x = 140 + 28x + -28x Combine like terms: 42x + -28x = 14x 14x = 140 + 28x + -28x Combine like terms: 28x + -28x = 0 14x = 140 + 0 14x = 140 Divide each side by '14'. x = 10 Simplifying x = 10
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