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Simplifying 21 + -4y = 9 + -2y Solving 21 + -4y = 9 + -2y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2y' to each side of the equation. 21 + -4y + 2y = 9 + -2y + 2y Combine like terms: -4y + 2y = -2y 21 + -2y = 9 + -2y + 2y Combine like terms: -2y + 2y = 0 21 + -2y = 9 + 0 21 + -2y = 9 Add '-21' to each side of the equation. 21 + -21 + -2y = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -2y = 9 + -21 -2y = 9 + -21 Combine like terms: 9 + -21 = -12 -2y = -12 Divide each side by '-2'. y = 6 Simplifying y = 6
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