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Simplifying -7y + -21 = 9(y + 3) Reorder the terms: -21 + -7y = 9(y + 3) Reorder the terms: -21 + -7y = 9(3 + y) -21 + -7y = (3 * 9 + y * 9) -21 + -7y = (27 + 9y) Solving -21 + -7y = 27 + 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. -21 + -7y + -9y = 27 + 9y + -9y Combine like terms: -7y + -9y = -16y -21 + -16y = 27 + 9y + -9y Combine like terms: 9y + -9y = 0 -21 + -16y = 27 + 0 -21 + -16y = 27 Add '21' to each side of the equation. -21 + 21 + -16y = 27 + 21 Combine like terms: -21 + 21 = 0 0 + -16y = 27 + 21 -16y = 27 + 21 Combine like terms: 27 + 21 = 48 -16y = 48 Divide each side by '-16'. y = -3 Simplifying y = -3
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