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Simplifying 4b + 19 + -1(-6b) = -21 Remove parenthesis around (-6b) 4b + 19 + -1 * -6b = -21 Multiply -1 * -6 4b + 19 + 6b = -21 Reorder the terms: 19 + 4b + 6b = -21 Combine like terms: 4b + 6b = 10b 19 + 10b = -21 Solving 19 + 10b = -21 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-19' to each side of the equation. 19 + -19 + 10b = -21 + -19 Combine like terms: 19 + -19 = 0 0 + 10b = -21 + -19 10b = -21 + -19 Combine like terms: -21 + -19 = -40 10b = -40 Divide each side by '10'. b = -4 Simplifying b = -4
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