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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 = 7 7x = 7 Divide each side by '7'. x = 1 Simplifying x = 1
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