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Simplifying 18 + -3(x + 2) = 21 Reorder the terms: 18 + -3(2 + x) = 21 18 + (2 * -3 + x * -3) = 21 18 + (-6 + -3x) = 21 Combine like terms: 18 + -6 = 12 12 + -3x = 21 Solving 12 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + -3x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -3x = 21 + -12 -3x = 21 + -12 Combine like terms: 21 + -12 = 9 -3x = 9 Divide each side by '-3'. x = -3 Simplifying x = -3
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