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Simplifying -7(x + 1) = 21 Reorder the terms: -7(1 + x) = 21 (1 * -7 + x * -7) = 21 (-7 + -7x) = 21 Solving -7 + -7x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -7x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + -7x = 21 + 7 -7x = 21 + 7 Combine like terms: 21 + 7 = 28 -7x = 28 Divide each side by '-7'. x = -4 Simplifying x = -4
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