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Simplifying (-12u + -13) + -1(-13u) = 0 Reorder the terms: (-13 + -12u) + -1(-13u) = 0 Remove parenthesis around (-13 + -12u) -13 + -12u + -1(-13u) = 0 Remove parenthesis around (-13u) -13 + -12u + -1 * -13u = 0 Multiply -1 * -13 -13 + -12u + 13u = 0 Combine like terms: -12u + 13u = 1u -13 + 1u = 0 Solving -13 + 1u = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 1u = 0 + 13 Combine like terms: -13 + 13 = 0 0 + 1u = 0 + 13 1u = 0 + 13 Combine like terms: 0 + 13 = 13 1u = 13 Divide each side by '1'. u = 13 Simplifying u = 13
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