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Simplifying -7(4x + 3) = -21 Reorder the terms: -7(3 + 4x) = -21 (3 * -7 + 4x * -7) = -21 (-21 + -28x) = -21 Add '21' to each side of the equation. -21 + 21 + -28x = -21 + 21 Combine like terms: -21 + 21 = 0 0 + -28x = -21 + 21 -28x = -21 + 21 Combine like terms: -21 + 21 = 0 -28x = 0 Solving -28x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '-28'. x = 0 Simplifying x = 0
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