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Simplifying 12 + -21y = 10y + 40 Reorder the terms: 12 + -21y = 40 + 10y Solving 12 + -21y = 40 + 10y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-10y' to each side of the equation. 12 + -21y + -10y = 40 + 10y + -10y Combine like terms: -21y + -10y = -31y 12 + -31y = 40 + 10y + -10y Combine like terms: 10y + -10y = 0 12 + -31y = 40 + 0 12 + -31y = 40 Add '-12' to each side of the equation. 12 + -12 + -31y = 40 + -12 Combine like terms: 12 + -12 = 0 0 + -31y = 40 + -12 -31y = 40 + -12 Combine like terms: 40 + -12 = 28 -31y = 28 Divide each side by '-31'. y = -0.9032258065 Simplifying y = -0.9032258065
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