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Simplifying -21 = 4b + 18 + -1(-6b) Remove parenthesis around (-6b) -21 = 4b + 18 + -1 * -6b Multiply -1 * -6 -21 = 4b + 18 + 6b Reorder the terms: -21 = 18 + 4b + 6b Combine like terms: 4b + 6b = 10b -21 = 18 + 10b Solving -21 = 18 + 10b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-10b' to each side of the equation. -21 + -10b = 18 + 10b + -10b Combine like terms: 10b + -10b = 0 -21 + -10b = 18 + 0 -21 + -10b = 18 Add '21' to each side of the equation. -21 + 21 + -10b = 18 + 21 Combine like terms: -21 + 21 = 0 0 + -10b = 18 + 21 -10b = 18 + 21 Combine like terms: 18 + 21 = 39 -10b = 39 Divide each side by '-10'. b = -3.9 Simplifying b = -3.9
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