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Simplifying 2(-4 + -1k) + 7 = -2k + -1 (-4 * 2 + -1k * 2) + 7 = -2k + -1 (-8 + -2k) + 7 = -2k + -1 Reorder the terms: -8 + 7 + -2k = -2k + -1 Combine like terms: -8 + 7 = -1 -1 + -2k = -2k + -1 Reorder the terms: -1 + -2k = -1 + -2k Add '1' to each side of the equation. -1 + 1 + -2k = -1 + 1 + -2k Combine like terms: -1 + 1 = 0 0 + -2k = -1 + 1 + -2k -2k = -1 + 1 + -2k Combine like terms: -1 + 1 = 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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