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Simplifying 2x + -7(-1x + 9) = 18 Reorder the terms: 2x + -7(9 + -1x) = 18 2x + (9 * -7 + -1x * -7) = 18 2x + (-63 + 7x) = 18 Reorder the terms: -63 + 2x + 7x = 18 Combine like terms: 2x + 7x = 9x -63 + 9x = 18 Solving -63 + 9x = 18 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 = 18 + 63 Combine like terms: -63 + 63 = 0 0 + 9x = 18 + 63 9x = 18 + 63 Combine like terms: 18 + 63 = 81 9x = 81 Divide each side by '9'. x = 9 Simplifying x = 9
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