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Simplifying -21 = 10y + -7y Combine like terms: 10y + -7y = 3y -21 = 3y Solving -21 = 3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3y' to each side of the equation. -21 + -3y = 3y + -3y Combine like terms: 3y + -3y = 0 -21 + -3y = 0 Add '21' to each side of the equation. -21 + 21 + -3y = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -3y = 0 + 21 -3y = 0 + 21 Combine like terms: 0 + 21 = 21 -3y = 21 Divide each side by '-3'. y = -7 Simplifying y = -7
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