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Simplifying -143 = 4 + 7(3 + 3b) -143 = 4 + (3 * 7 + 3b * 7) -143 = 4 + (21 + 21b) Combine like terms: 4 + 21 = 25 -143 = 25 + 21b Solving -143 = 25 + 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. -143 + -21b = 25 + 21b + -21b Combine like terms: 21b + -21b = 0 -143 + -21b = 25 + 0 -143 + -21b = 25 Add '143' to each side of the equation. -143 + 143 + -21b = 25 + 143 Combine like terms: -143 + 143 = 0 0 + -21b = 25 + 143 -21b = 25 + 143 Combine like terms: 25 + 143 = 168 -21b = 168 Divide each side by '-21'. b = -8 Simplifying b = -8
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