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Simplifying 7(x + 9y) = 7(9 + 9 * 7) (x * 7 + 9y * 7) = 7(9 + 9 * 7) (7x + 63y) = 7(9 + 9 * 7) Multiply 9 * 7 7x + 63y = 7(9 + 63) Combine like terms: 9 + 63 = 72 7x + 63y = 7(72) Multiply 7 * 72 7x + 63y = 504 Solving 7x + 63y = 504 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-63y' to each side of the equation. 7x + 63y + -63y = 504 + -63y Combine like terms: 63y + -63y = 0 7x + 0 = 504 + -63y 7x = 504 + -63y Divide each side by '7'. x = 72 + -9y Simplifying x = 72 + -9y
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