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Simplifying 2y + -1(4y + -5) = 21 Reorder the terms: 2y + -1(-5 + 4y) = 21 2y + (-5 * -1 + 4y * -1) = 21 2y + (5 + -4y) = 21 Reorder the terms: 5 + 2y + -4y = 21 Combine like terms: 2y + -4y = -2y 5 + -2y = 21 Solving 5 + -2y = 21 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -2y = 21 + -5 Combine like terms: 5 + -5 = 0 0 + -2y = 21 + -5 -2y = 21 + -5 Combine like terms: 21 + -5 = 16 -2y = 16 Divide each side by '-2'. y = -8 Simplifying y = -8
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