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Simplifying -31 = -7 + 4u Solving -31 = -7 + 4u Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-4u' to each side of the equation. -31 + -4u = -7 + 4u + -4u Combine like terms: 4u + -4u = 0 -31 + -4u = -7 + 0 -31 + -4u = -7 Add '31' to each side of the equation. -31 + 31 + -4u = -7 + 31 Combine like terms: -31 + 31 = 0 0 + -4u = -7 + 31 -4u = -7 + 31 Combine like terms: -7 + 31 = 24 -4u = 24 Divide each side by '-4'. u = -6 Simplifying u = -6
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