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Simplifying -21 = 4b + 19 + -1(6b) Remove parenthesis around (6b) -21 = 4b + 19 + -1 * 6b Multiply -1 * 6 -21 = 4b + 19 + -6b Reorder the terms: -21 = 19 + 4b + -6b Combine like terms: 4b + -6b = -2b -21 = 19 + -2b Solving -21 = 19 + -2b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '2b' to each side of the equation. -21 + 2b = 19 + -2b + 2b Combine like terms: -2b + 2b = 0 -21 + 2b = 19 + 0 -21 + 2b = 19 Add '21' to each side of the equation. -21 + 21 + 2b = 19 + 21 Combine like terms: -21 + 21 = 0 0 + 2b = 19 + 21 2b = 19 + 21 Combine like terms: 19 + 21 = 40 2b = 40 Divide each side by '2'. b = 20 Simplifying b = 20
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