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Simplifying 2x + -3(x + 4) = -21 Reorder the terms: 2x + -3(4 + x) = -21 2x + (4 * -3 + x * -3) = -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 = -9 -1x = -9 Divide each side by '-1'. x = 9 Simplifying x = 9
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