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Simplifying -147 = -7(3b + 3) Reorder the terms: -147 = -7(3 + 3b) -147 = (3 * -7 + 3b * -7) -147 = (-21 + -21b) Solving -147 = -21 + -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. -147 + 21b = -21 + -21b + 21b Combine like terms: -21b + 21b = 0 -147 + 21b = -21 + 0 -147 + 21b = -21 Add '147' to each side of the equation. -147 + 147 + 21b = -21 + 147 Combine like terms: -147 + 147 = 0 0 + 21b = -21 + 147 21b = -21 + 147 Combine like terms: -21 + 147 = 126 21b = 126 Divide each side by '21'. b = 6 Simplifying b = 6
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