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Simplifying 7x + 3(x + -9) = 63 Reorder the terms: 7x + 3(-9 + x) = 63 7x + (-9 * 3 + x * 3) = 63 7x + (-27 + 3x) = 63 Reorder the terms: -27 + 7x + 3x = 63 Combine like terms: 7x + 3x = 10x -27 + 10x = 63 Solving -27 + 10x = 63 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '27' to each side of the equation. -27 + 27 + 10x = 63 + 27 Combine like terms: -27 + 27 = 0 0 + 10x = 63 + 27 10x = 63 + 27 Combine like terms: 63 + 27 = 90 10x = 90 Divide each side by '10'. x = 9 Simplifying x = 9
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