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Simplifying 63 = -15b + -6b Combine like terms: -15b + -6b = -21b 63 = -21b Solving 63 = -21b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '21b' to each side of the equation. 63 + 21b = -21b + 21b Combine like terms: -21b + 21b = 0 63 + 21b = 0 Add '-63' to each side of the equation. 63 + -63 + 21b = 0 + -63 Combine like terms: 63 + -63 = 0 0 + 21b = 0 + -63 21b = 0 + -63 Combine like terms: 0 + -63 = -63 21b = -63 Divide each side by '21'. b = -3 Simplifying b = -3
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