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Simplifying 7(y + -3) = 9y + -21 Reorder the terms: 7(-3 + y) = 9y + -21 (-3 * 7 + y * 7) = 9y + -21 (-21 + 7y) = 9y + -21 Reorder the terms: -21 + 7y = -21 + 9y Add '21' to each side of the equation. -21 + 21 + 7y = -21 + 21 + 9y Combine like terms: -21 + 21 = 0 0 + 7y = -21 + 21 + 9y 7y = -21 + 21 + 9y Combine like terms: -21 + 21 = 0 7y = 0 + 9y 7y = 9y Solving 7y = 9y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-9y' to each side of the equation. 7y + -9y = 9y + -9y Combine like terms: 7y + -9y = -2y -2y = 9y + -9y Combine like terms: 9y + -9y = 0 -2y = 0 Divide each side by '-2'. y = 0 Simplifying y = 0
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