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Simplifying u + -20 + 7u + -28 = -6 + 7(2u + -6) + -6u Reorder the terms: -20 + -28 + u + 7u = -6 + 7(2u + -6) + -6u Combine like terms: -20 + -28 = -48 -48 + u + 7u = -6 + 7(2u + -6) + -6u Combine like terms: u + 7u = 8u -48 + 8u = -6 + 7(2u + -6) + -6u Reorder the terms: -48 + 8u = -6 + 7(-6 + 2u) + -6u -48 + 8u = -6 + (-6 * 7 + 2u * 7) + -6u -48 + 8u = -6 + (-42 + 14u) + -6u Combine like terms: -6 + -42 = -48 -48 + 8u = -48 + 14u + -6u Combine like terms: 14u + -6u = 8u -48 + 8u = -48 + 8u Add '48' to each side of the equation. -48 + 48 + 8u = -48 + 48 + 8u Combine like terms: -48 + 48 = 0 0 + 8u = -48 + 48 + 8u 8u = -48 + 48 + 8u Combine like terms: -48 + 48 = 0 8u = 0 + 8u 8u = 8u Add '-8u' to each side of the equation. 8u + -8u = 8u + -8u Combine like terms: 8u + -8u = 0 0 = 8u + -8u Combine like terms: 8u + -8u = 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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