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Simplifying 18x + -1(9x + 3) = 21 Reorder the terms: 18x + -1(3 + 9x) = 21 18x + (3 * -1 + 9x * -1) = 21 18x + (-3 + -9x) = 21 Reorder the terms: -3 + 18x + -9x = 21 Combine like terms: 18x + -9x = 9x -3 + 9x = 21 Solving -3 + 9x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 9x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 9x = 21 + 3 9x = 21 + 3 Combine like terms: 21 + 3 = 24 9x = 24 Divide each side by '9'. x = 2.666666667 Simplifying x = 2.666666667
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