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Simplifying 2x + -3(3 + 2x) = 21 2x + (3 * -3 + 2x * -3) = 21 2x + (-9 + -6x) = 21 Reorder the terms: -9 + 2x + -6x = 21 Combine like terms: 2x + -6x = -4x -9 + -4x = 21 Solving -9 + -4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -4x = 21 + 9 Combine like terms: -9 + 9 = 0 0 + -4x = 21 + 9 -4x = 21 + 9 Combine like terms: 21 + 9 = 30 -4x = 30 Divide each side by '-4'. x = -7.5 Simplifying x = -7.5
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