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Simplifying 21 = 7y + 7 + (y + 3) Reorder the terms: 21 = 7y + 7 + (3 + y) Remove parenthesis around (3 + y) 21 = 7y + 7 + 3 + y Reorder the terms: 21 = 7 + 3 + 7y + y Combine like terms: 7 + 3 = 10 21 = 10 + 7y + y Combine like terms: 7y + y = 8y 21 = 10 + 8y Solving 21 = 10 + 8y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-8y' to each side of the equation. 21 + -8y = 10 + 8y + -8y Combine like terms: 8y + -8y = 0 21 + -8y = 10 + 0 21 + -8y = 10 Add '-21' to each side of the equation. 21 + -21 + -8y = 10 + -21 Combine like terms: 21 + -21 = 0 0 + -8y = 10 + -21 -8y = 10 + -21 Combine like terms: 10 + -21 = -11 -8y = -11 Divide each side by '-8'. y = 1.375 Simplifying y = 1.375
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