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Simplifying 21 + -1(-4y) = 5 Remove parenthesis around (-4y) 21 + -1 * -4y = 5 Multiply -1 * -4 21 + 4y = 5 Solving 21 + 4y = 5 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 4y = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 4y = 5 + -21 4y = 5 + -21 Combine like terms: 5 + -21 = -16 4y = -16 Divide each side by '4'. y = -4 Simplifying y = -4
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