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Simplifying 2x + 7(x + 9) = 144 Reorder the terms: 2x + 7(9 + x) = 144 2x + (9 * 7 + x * 7) = 144 2x + (63 + 7x) = 144 Reorder the terms: 63 + 2x + 7x = 144 Combine like terms: 2x + 7x = 9x 63 + 9x = 144 Solving 63 + 9x = 144 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 + 9x = 144 + -63 Combine like terms: 63 + -63 = 0 0 + 9x = 144 + -63 9x = 144 + -63 Combine like terms: 144 + -63 = 81 9x = 81 Divide each side by '9'. x = 9 Simplifying x = 9
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