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Simplifying -81 = 3(4b + -7) Reorder the terms: -81 = 3(-7 + 4b) -81 = (-7 * 3 + 4b * 3) -81 = (-21 + 12b) Solving -81 = -21 + 12b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-12b' to each side of the equation. -81 + -12b = -21 + 12b + -12b Combine like terms: 12b + -12b = 0 -81 + -12b = -21 + 0 -81 + -12b = -21 Add '81' to each side of the equation. -81 + 81 + -12b = -21 + 81 Combine like terms: -81 + 81 = 0 0 + -12b = -21 + 81 -12b = -21 + 81 Combine like terms: -21 + 81 = 60 -12b = 60 Divide each side by '-12'. b = -5 Simplifying b = -5
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