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Simplifying 13 = -1(y + 7) Reorder the terms: 13 = -1(7 + y) 13 = (7 * -1 + y * -1) 13 = (-7 + -1y) Solving 13 = -7 + -1y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add 'y' to each side of the equation. 13 + y = -7 + -1y + y Combine like terms: -1y + y = 0 13 + y = -7 + 0 13 + y = -7 Add '-13' to each side of the equation. 13 + -13 + y = -7 + -13 Combine like terms: 13 + -13 = 0 0 + y = -7 + -13 y = -7 + -13 Combine like terms: -7 + -13 = -20 y = -20 Simplifying y = -20
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