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Simplifying -81 = 7(-3b + -8) + -4b Reorder the terms: -81 = 7(-8 + -3b) + -4b -81 = (-8 * 7 + -3b * 7) + -4b -81 = (-56 + -21b) + -4b Combine like terms: -21b + -4b = -25b -81 = -56 + -25b Solving -81 = -56 + -25b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '25b' to each side of the equation. -81 + 25b = -56 + -25b + 25b Combine like terms: -25b + 25b = 0 -81 + 25b = -56 + 0 -81 + 25b = -56 Add '81' to each side of the equation. -81 + 81 + 25b = -56 + 81 Combine like terms: -81 + 81 = 0 0 + 25b = -56 + 81 25b = -56 + 81 Combine like terms: -56 + 81 = 25 25b = 25 Divide each side by '25'. b = 1 Simplifying b = 1
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