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Simplifying 10x + 21(x + -3) = 402 Reorder the terms: 10x + 21(-3 + x) = 402 10x + (-3 * 21 + x * 21) = 402 10x + (-63 + 21x) = 402 Reorder the terms: -63 + 10x + 21x = 402 Combine like terms: 10x + 21x = 31x -63 + 31x = 402 Solving -63 + 31x = 402 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 31x = 402 + 63 Combine like terms: -63 + 63 = 0 0 + 31x = 402 + 63 31x = 402 + 63 Combine like terms: 402 + 63 = 465 31x = 465 Divide each side by '31'. x = 15 Simplifying x = 15
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