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Simplifying -84 + 15b = 3b Solving -84 + 15b = 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. -84 + 15b + -3b = 3b + -3b Combine like terms: 15b + -3b = 12b -84 + 12b = 3b + -3b Combine like terms: 3b + -3b = 0 -84 + 12b = 0 Add '84' to each side of the equation. -84 + 84 + 12b = 0 + 84 Combine like terms: -84 + 84 = 0 0 + 12b = 0 + 84 12b = 0 + 84 Combine like terms: 0 + 84 = 84 12b = 84 Divide each side by '12'. b = 7 Simplifying b = 7
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