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Simplifying 21y = 9 + -1(19y + -23) Reorder the terms: 21y = 9 + -1(-23 + 19y) 21y = 9 + (-23 * -1 + 19y * -1) 21y = 9 + (23 + -19y) Combine like terms: 9 + 23 = 32 21y = 32 + -19y Solving 21y = 32 + -19y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '19y' to each side of the equation. 21y + 19y = 32 + -19y + 19y Combine like terms: 21y + 19y = 40y 40y = 32 + -19y + 19y Combine like terms: -19y + 19y = 0 40y = 32 + 0 40y = 32 Divide each side by '40'. y = 0.8 Simplifying y = 0.8
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