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Simplifying 3 + -1(7 + 2k) = -2k + -4 3 + (7 * -1 + 2k * -1) = -2k + -4 3 + (-7 + -2k) = -2k + -4 Combine like terms: 3 + -7 = -4 -4 + -2k = -2k + -4 Reorder the terms: -4 + -2k = -4 + -2k Add '4' to each side of the equation. -4 + 4 + -2k = -4 + 4 + -2k Combine like terms: -4 + 4 = 0 0 + -2k = -4 + 4 + -2k -2k = -4 + 4 + -2k Combine like terms: -4 + 4 = 0 -2k = 0 + -2k -2k = -2k Add '2k' to each side of the equation. -2k + 2k = -2k + 2k Combine like terms: -2k + 2k = 0 0 = -2k + 2k Combine like terms: -2k + 2k = 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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