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Simplifying -21 = 7(y + 3) Reorder the terms: -21 = 7(3 + y) -21 = (3 * 7 + y * 7) -21 = (21 + 7y) Solving -21 = 21 + 7y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7y' to each side of the equation. -21 + -7y = 21 + 7y + -7y Combine like terms: 7y + -7y = 0 -21 + -7y = 21 + 0 -21 + -7y = 21 Add '21' to each side of the equation. -21 + 21 + -7y = 21 + 21 Combine like terms: -21 + 21 = 0 0 + -7y = 21 + 21 -7y = 21 + 21 Combine like terms: 21 + 21 = 42 -7y = 42 Divide each side by '-7'. y = -6 Simplifying y = -6
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