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Simplifying 3 * 4 + 21x * 3 = 1272 Multiply 3 * 4 12 + 21x * 3 = 1272 Reorder the terms for easier multiplication: 12 + 21 * 3x = 1272 Multiply 21 * 3 12 + 63x = 1272 Solving 12 + 63x = 1272 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 63x = 1272 + -12 Combine like terms: 12 + -12 = 0 0 + 63x = 1272 + -12 63x = 1272 + -12 Combine like terms: 1272 + -12 = 1260 63x = 1260 Divide each side by '63'. x = 20 Simplifying x = 20
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