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Simplifying (21b + -4) + -5(4b + 1) = -2 Reorder the terms: (-4 + 21b) + -5(4b + 1) = -2 Remove parenthesis around (-4 + 21b) -4 + 21b + -5(4b + 1) = -2 Reorder the terms: -4 + 21b + -5(1 + 4b) = -2 -4 + 21b + (1 * -5 + 4b * -5) = -2 -4 + 21b + (-5 + -20b) = -2 Reorder the terms: -4 + -5 + 21b + -20b = -2 Combine like terms: -4 + -5 = -9 -9 + 21b + -20b = -2 Combine like terms: 21b + -20b = 1b -9 + 1b = -2 Solving -9 + 1b = -2 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 + 1b = -2 + 9 Combine like terms: -9 + 9 = 0 0 + 1b = -2 + 9 1b = -2 + 9 Combine like terms: -2 + 9 = 7 1b = 7 Divide each side by '1'. b = 7 Simplifying b = 7
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