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Simplifying 3y + -21 = -4(y + 7) Reorder the terms: -21 + 3y = -4(y + 7) Reorder the terms: -21 + 3y = -4(7 + y) -21 + 3y = (7 * -4 + y * -4) -21 + 3y = (-28 + -4y) Solving -21 + 3y = -28 + -4y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '4y' to each side of the equation. -21 + 3y + 4y = -28 + -4y + 4y Combine like terms: 3y + 4y = 7y -21 + 7y = -28 + -4y + 4y Combine like terms: -4y + 4y = 0 -21 + 7y = -28 + 0 -21 + 7y = -28 Add '21' to each side of the equation. -21 + 21 + 7y = -28 + 21 Combine like terms: -21 + 21 = 0 0 + 7y = -28 + 21 7y = -28 + 21 Combine like terms: -28 + 21 = -7 7y = -7 Divide each side by '7'. y = -1 Simplifying y = -1
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