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Simplifying 87 = -3(y + -7) Reorder the terms: 87 = -3(-7 + y) 87 = (-7 * -3 + y * -3) 87 = (21 + -3y) Solving 87 = 21 + -3y Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3y' to each side of the equation. 87 + 3y = 21 + -3y + 3y Combine like terms: -3y + 3y = 0 87 + 3y = 21 + 0 87 + 3y = 21 Add '-87' to each side of the equation. 87 + -87 + 3y = 21 + -87 Combine like terms: 87 + -87 = 0 0 + 3y = 21 + -87 3y = 21 + -87 Combine like terms: 21 + -87 = -66 3y = -66 Divide each side by '3'. y = -22 Simplifying y = -22
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