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Simplifying 2b + -1(-9b) + -13b + -9 = -1 Remove parenthesis around (-9b) 2b + -1 * -9b + -13b + -9 = -1 Multiply -1 * -9 2b + 9b + -13b + -9 = -1 Reorder the terms: -9 + 2b + 9b + -13b = -1 Combine like terms: 2b + 9b = 11b -9 + 11b + -13b = -1 Combine like terms: 11b + -13b = -2b -9 + -2b = -1 Solving -9 + -2b = -1 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -2b = -1 + 9 Combine like terms: -9 + 9 = 0 0 + -2b = -1 + 9 -2b = -1 + 9 Combine like terms: -1 + 9 = 8 -2b = 8 Divide each side by '-2'. b = -4 Simplifying b = -4
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