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Simplifying (-21 + -9b) + 15 = 0 Remove parenthesis around (-21 + -9b) -21 + -9b + 15 = 0 Reorder the terms: -21 + 15 + -9b = 0 Combine like terms: -21 + 15 = -6 -6 + -9b = 0 Solving -6 + -9b = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + -9b = 0 + 6 Combine like terms: -6 + 6 = 0 0 + -9b = 0 + 6 -9b = 0 + 6 Combine like terms: 0 + 6 = 6 -9b = 6 Divide each side by '-9'. b = -0.6666666667 Simplifying b = -0.6666666667
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