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Simplifying -7b + -66 = 21 + -2b Reorder the terms: -66 + -7b = 21 + -2b Solving -66 + -7b = 21 + -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. -66 + -7b + 2b = 21 + -2b + 2b Combine like terms: -7b + 2b = -5b -66 + -5b = 21 + -2b + 2b Combine like terms: -2b + 2b = 0 -66 + -5b = 21 + 0 -66 + -5b = 21 Add '66' to each side of the equation. -66 + 66 + -5b = 21 + 66 Combine like terms: -66 + 66 = 0 0 + -5b = 21 + 66 -5b = 21 + 66 Combine like terms: 21 + 66 = 87 -5b = 87 Divide each side by '-5'. b = -17.4 Simplifying b = -17.4
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