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Simplifying 2x + -1(12 + 3x) = 21 2x + (12 * -1 + 3x * -1) = 21 2x + (-12 + -3x) = 21 Reorder the terms: -12 + 2x + -3x = 21 Combine like terms: 2x + -3x = -1x -12 + -1x = 21 Solving -12 + -1x = 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 + -1x = 21 + 12 Combine like terms: -12 + 12 = 0 0 + -1x = 21 + 12 -1x = 21 + 12 Combine like terms: 21 + 12 = 33 -1x = 33 Divide each side by '-1'. x = -33 Simplifying x = -33
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