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Simplifying -21 + -8u = 3(4u + 7) Reorder the terms: -21 + -8u = 3(7 + 4u) -21 + -8u = (7 * 3 + 4u * 3) -21 + -8u = (21 + 12u) Solving -21 + -8u = 21 + 12u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-12u' to each side of the equation. -21 + -8u + -12u = 21 + 12u + -12u Combine like terms: -8u + -12u = -20u -21 + -20u = 21 + 12u + -12u Combine like terms: 12u + -12u = 0 -21 + -20u = 21 + 0 -21 + -20u = 21 Add '21' to each side of the equation. -21 + 21 + -20u = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -20u = 21 + 21 -20u = 21 + 21 Combine like terms: 21 + 21 = 42 -20u = 42 Divide each side by '-20'. u = -2.1 Simplifying u = -2.1
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