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Simplifying 4(2x + -3) + 15 = -21 Reorder the terms: 4(-3 + 2x) + 15 = -21 (-3 * 4 + 2x * 4) + 15 = -21 (-12 + 8x) + 15 = -21 Reorder the terms: -12 + 15 + 8x = -21 Combine like terms: -12 + 15 = 3 3 + 8x = -21 Solving 3 + 8x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 8x = -21 + -3 Combine like terms: 3 + -3 = 0 0 + 8x = -21 + -3 8x = -21 + -3 Combine like terms: -21 + -3 = -24 8x = -24 Divide each side by '8'. x = -3 Simplifying x = -3
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