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Simplifying 21 + -4b = -7(3b + -3) Reorder the terms: 21 + -4b = -7(-3 + 3b) 21 + -4b = (-3 * -7 + 3b * -7) 21 + -4b = (21 + -21b) Add '-21' to each side of the equation. 21 + -21 + -4b = 21 + -21 + -21b Combine like terms: 21 + -21 = 0 0 + -4b = 21 + -21 + -21b -4b = 21 + -21 + -21b Combine like terms: 21 + -21 = 0 -4b = 0 + -21b -4b = -21b Solving -4b = -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. -4b + 21b = -21b + 21b Combine like terms: -4b + 21b = 17b 17b = -21b + 21b Combine like terms: -21b + 21b = 0 17b = 0 Divide each side by '17'. b = 0 Simplifying b = 0
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