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Simplifying 2y + 21 + -6y = 12 + y + -7 Reorder the terms: 21 + 2y + -6y = 12 + y + -7 Combine like terms: 2y + -6y = -4y 21 + -4y = 12 + y + -7 Reorder the terms: 21 + -4y = 12 + -7 + y Combine like terms: 12 + -7 = 5 21 + -4y = 5 + y Solving 21 + -4y = 5 + y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1y' to each side of the equation. 21 + -4y + -1y = 5 + y + -1y Combine like terms: -4y + -1y = -5y 21 + -5y = 5 + y + -1y Combine like terms: y + -1y = 0 21 + -5y = 5 + 0 21 + -5y = 5 Add '-21' to each side of the equation. 21 + -21 + -5y = 5 + -21 Combine like terms: 21 + -21 = 0 0 + -5y = 5 + -21 -5y = 5 + -21 Combine like terms: 5 + -21 = -16 -5y = -16 Divide each side by '-5'. y = 3.2 Simplifying y = 3.2
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