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Simplifying -4(4x + 7) = -21 Reorder the terms: -4(7 + 4x) = -21 (7 * -4 + 4x * -4) = -21 (-28 + -16x) = -21 Solving -28 + -16x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '28' to each side of the equation. -28 + 28 + -16x = -21 + 28 Combine like terms: -28 + 28 = 0 0 + -16x = -21 + 28 -16x = -21 + 28 Combine like terms: -21 + 28 = 7 -16x = 7 Divide each side by '-16'. x = -0.4375 Simplifying x = -0.4375
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