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Simplifying 3b + -2(6 + -2b) = 13 + -4 3b + (6 * -2 + -2b * -2) = 13 + -4 3b + (-12 + 4b) = 13 + -4 Reorder the terms: -12 + 3b + 4b = 13 + -4 Combine like terms: 3b + 4b = 7b -12 + 7b = 13 + -4 Combine like terms: 13 + -4 = 9 -12 + 7b = 9 Solving -12 + 7b = 9 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '12' to each side of the equation. -12 + 12 + 7b = 9 + 12 Combine like terms: -12 + 12 = 0 0 + 7b = 9 + 12 7b = 9 + 12 Combine like terms: 9 + 12 = 21 7b = 21 Divide each side by '7'. b = 3 Simplifying b = 3
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