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Simplifying 3(6 + -1b) + -1(-5) = -7 (6 * 3 + -1b * 3) + -1(-5) = -7 (18 + -3b) + -1(-5) = -7 Multiply -1 * -5 18 + -3b + 5 = -7 Reorder the terms: 18 + 5 + -3b = -7 Combine like terms: 18 + 5 = 23 23 + -3b = -7 Solving 23 + -3b = -7 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-23' to each side of the equation. 23 + -23 + -3b = -7 + -23 Combine like terms: 23 + -23 = 0 0 + -3b = -7 + -23 -3b = -7 + -23 Combine like terms: -7 + -23 = -30 -3b = -30 Divide each side by '-3'. b = 10 Simplifying b = 10
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