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Simplifying 20u + -20 = 3(5u + -9) + 5u + 7 Reorder the terms: -20 + 20u = 3(5u + -9) + 5u + 7 Reorder the terms: -20 + 20u = 3(-9 + 5u) + 5u + 7 -20 + 20u = (-9 * 3 + 5u * 3) + 5u + 7 -20 + 20u = (-27 + 15u) + 5u + 7 Reorder the terms: -20 + 20u = -27 + 7 + 15u + 5u Combine like terms: -27 + 7 = -20 -20 + 20u = -20 + 15u + 5u Combine like terms: 15u + 5u = 20u -20 + 20u = -20 + 20u Add '20' to each side of the equation. -20 + 20 + 20u = -20 + 20 + 20u Combine like terms: -20 + 20 = 0 0 + 20u = -20 + 20 + 20u 20u = -20 + 20 + 20u Combine like terms: -20 + 20 = 0 20u = 0 + 20u 20u = 20u Add '-20u' to each side of the equation. 20u + -20u = 20u + -20u Combine like terms: 20u + -20u = 0 0 = 20u + -20u Combine like terms: 20u + -20u = 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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