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Simplifying -90 = 2b + -2(-4b + 5) Reorder the terms: -90 = 2b + -2(5 + -4b) -90 = 2b + (5 * -2 + -4b * -2) -90 = 2b + (-10 + 8b) Reorder the terms: -90 = -10 + 2b + 8b Combine like terms: 2b + 8b = 10b -90 = -10 + 10b Solving -90 = -10 + 10b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-10b' to each side of the equation. -90 + -10b = -10 + 10b + -10b Combine like terms: 10b + -10b = 0 -90 + -10b = -10 + 0 -90 + -10b = -10 Add '90' to each side of the equation. -90 + 90 + -10b = -10 + 90 Combine like terms: -90 + 90 = 0 0 + -10b = -10 + 90 -10b = -10 + 90 Combine like terms: -10 + 90 = 80 -10b = 80 Divide each side by '-10'. b = -8 Simplifying b = -8
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