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Simplifying 20 + -4y = 30 + 21y Solving 20 + -4y = 30 + 21y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-21y' to each side of the equation. 20 + -4y + -21y = 30 + 21y + -21y Combine like terms: -4y + -21y = -25y 20 + -25y = 30 + 21y + -21y Combine like terms: 21y + -21y = 0 20 + -25y = 30 + 0 20 + -25y = 30 Add '-20' to each side of the equation. 20 + -20 + -25y = 30 + -20 Combine like terms: 20 + -20 = 0 0 + -25y = 30 + -20 -25y = 30 + -20 Combine like terms: 30 + -20 = 10 -25y = 10 Divide each side by '-25'. y = -0.4 Simplifying y = -0.4
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