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Simplifying -7(-4u + y + -3) = 0 Reorder the terms: -7(-3 + -4u + y) = 0 (-3 * -7 + -4u * -7 + y * -7) = 0 (21 + 28u + -7y) = 0 Solving 21 + 28u + -7y = 0 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 28u + -21 + -7y = 0 + -21 Reorder the terms: 21 + -21 + 28u + -7y = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 28u + -7y = 0 + -21 28u + -7y = 0 + -21 Combine like terms: 0 + -21 = -21 28u + -7y = -21 Add '7y' to each side of the equation. 28u + -7y + 7y = -21 + 7y Combine like terms: -7y + 7y = 0 28u + 0 = -21 + 7y 28u = -21 + 7y Divide each side by '28'. u = -0.75 + 0.25y Simplifying u = -0.75 + 0.25y
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