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Simplifying -21 = 4y + 2y Combine like terms: 4y + 2y = 6y -21 = 6y Solving -21 = 6y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-6y' to each side of the equation. -21 + -6y = 6y + -6y Combine like terms: 6y + -6y = 0 -21 + -6y = 0 Add '21' to each side of the equation. -21 + 21 + -6y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -6y = 0 + 21 -6y = 0 + 21 Combine like terms: 0 + 21 = 21 -6y = 21 Divide each side by '-6'. y = -3.5 Simplifying y = -3.5
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