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Simplifying 3b * 7 = 3(b + -4) Reorder the terms for easier multiplication: 3 * 7b = 3(b + -4) Multiply 3 * 7 21b = 3(b + -4) Reorder the terms: 21b = 3(-4 + b) 21b = (-4 * 3 + b * 3) 21b = (-12 + 3b) Solving 21b = -12 + 3b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-3b' to each side of the equation. 21b + -3b = -12 + 3b + -3b Combine like terms: 21b + -3b = 18b 18b = -12 + 3b + -3b Combine like terms: 3b + -3b = 0 18b = -12 + 0 18b = -12 Divide each side by '18'. b = -0.6666666667 Simplifying b = -0.6666666667
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