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Simplifying 3x + -7(9 + -1x) = 12 3x + (9 * -7 + -1x * -7) = 12 3x + (-63 + 7x) = 12 Reorder the terms: -63 + 3x + 7x = 12 Combine like terms: 3x + 7x = 10x -63 + 10x = 12 Solving -63 + 10x = 12 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 + 10x = 12 + 63 Combine like terms: -63 + 63 = 0 0 + 10x = 12 + 63 10x = 12 + 63 Combine like terms: 12 + 63 = 75 10x = 75 Divide each side by '10'. x = 7.5 Simplifying x = 7.5
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