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Simplifying 7k + -21 = 7(k + -3) Reorder the terms: -21 + 7k = 7(k + -3) Reorder the terms: -21 + 7k = 7(-3 + k) -21 + 7k = (-3 * 7 + k * 7) -21 + 7k = (-21 + 7k) Add '21' to each side of the equation. -21 + 21 + 7k = -21 + 21 + 7k Combine like terms: -21 + 21 = 0 0 + 7k = -21 + 21 + 7k 7k = -21 + 21 + 7k Combine like terms: -21 + 21 = 0 7k = 0 + 7k 7k = 7k Add '-7k' to each side of the equation. 7k + -7k = 7k + -7k Combine like terms: 7k + -7k = 0 0 = 7k + -7k Combine like terms: 7k + -7k = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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