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Simplifying -7(x + 4) = 21 Reorder the terms: -7(4 + x) = 21 (4 * -7 + x * -7) = 21 (-28 + -7x) = 21 Solving -28 + -7x = 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 + -7x = 21 + 28 Combine like terms: -28 + 28 = 0 0 + -7x = 21 + 28 -7x = 21 + 28 Combine like terms: 21 + 28 = 49 -7x = 49 Divide each side by '-7'. x = -7 Simplifying x = -7
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