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Simplifying -21 = 7b + -3b Combine like terms: 7b + -3b = 4b -21 = 4b Solving -21 = 4b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-4b' to each side of the equation. -21 + -4b = 4b + -4b Combine like terms: 4b + -4b = 0 -21 + -4b = 0 Add '21' to each side of the equation. -21 + 21 + -4b = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -4b = 0 + 21 -4b = 0 + 21 Combine like terms: 0 + 21 = 21 -4b = 21 Divide each side by '-4'. b = -5.25 Simplifying b = -5.25
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