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Simplifying -4(2x + 3) + 5x + 3 = -21 Reorder the terms: -4(3 + 2x) + 5x + 3 = -21 (3 * -4 + 2x * -4) + 5x + 3 = -21 (-12 + -8x) + 5x + 3 = -21 Reorder the terms: -12 + 3 + -8x + 5x = -21 Combine like terms: -12 + 3 = -9 -9 + -8x + 5x = -21 Combine like terms: -8x + 5x = -3x -9 + -3x = -21 Solving -9 + -3x = -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 + -3x = -21 + 9 Combine like terms: -9 + 9 = 0 0 + -3x = -21 + 9 -3x = -21 + 9 Combine like terms: -21 + 9 = -12 -3x = -12 Divide each side by '-3'. x = 4 Simplifying x = 4
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