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Simplifying 87 = -3(6 + -5b) 87 = (6 * -3 + -5b * -3) 87 = (-18 + 15b) Solving 87 = -18 + 15b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-15b' to each side of the equation. 87 + -15b = -18 + 15b + -15b Combine like terms: 15b + -15b = 0 87 + -15b = -18 + 0 87 + -15b = -18 Add '-87' to each side of the equation. 87 + -87 + -15b = -18 + -87 Combine like terms: 87 + -87 = 0 0 + -15b = -18 + -87 -15b = -18 + -87 Combine like terms: -18 + -87 = -105 -15b = -105 Divide each side by '-15'. b = 7 Simplifying b = 7
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