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