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Simplifying 2b + -3 = (21 + -1b) * 3 Reorder the terms: -3 + 2b = (21 + -1b) * 3 Reorder the terms for easier multiplication: -3 + 2b = 3(21 + -1b) -3 + 2b = (21 * 3 + -1b * 3) -3 + 2b = (63 + -3b) Solving -3 + 2b = 63 + -3b Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '3b' to each side of the equation. -3 + 2b + 3b = 63 + -3b + 3b Combine like terms: 2b + 3b = 5b -3 + 5b = 63 + -3b + 3b Combine like terms: -3b + 3b = 0 -3 + 5b = 63 + 0 -3 + 5b = 63 Add '3' to each side of the equation. -3 + 3 + 5b = 63 + 3 Combine like terms: -3 + 3 = 0 0 + 5b = 63 + 3 5b = 63 + 3 Combine like terms: 63 + 3 = 66 5b = 66 Divide each side by '5'. b = 13.2 Simplifying b = 13.2
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