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Simplifying -7 + -7k = -7(1 + k) -7 + -7k = (1 * -7 + k * -7) -7 + -7k = (-7 + -7k) Add '7' to each side of the equation. -7 + 7 + -7k = -7 + 7 + -7k Combine like terms: -7 + 7 = 0 0 + -7k = -7 + 7 + -7k -7k = -7 + 7 + -7k Combine like terms: -7 + 7 = 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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