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Simplifying 7(x + -7) = -21 Reorder the terms: 7(-7 + x) = -21 (-7 * 7 + x * 7) = -21 (-49 + 7x) = -21 Solving -49 + 7x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '49' to each side of the equation. -49 + 49 + 7x = -21 + 49 Combine like terms: -49 + 49 = 0 0 + 7x = -21 + 49 7x = -21 + 49 Combine like terms: -21 + 49 = 28 7x = 28 Divide each side by '7'. x = 4 Simplifying x = 4
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