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Simplifying -2(21 + -1b) + 3(b + -4) = 0 (21 * -2 + -1b * -2) + 3(b + -4) = 0 (-42 + 2b) + 3(b + -4) = 0 Reorder the terms: -42 + 2b + 3(-4 + b) = 0 -42 + 2b + (-4 * 3 + b * 3) = 0 -42 + 2b + (-12 + 3b) = 0 Reorder the terms: -42 + -12 + 2b + 3b = 0 Combine like terms: -42 + -12 = -54 -54 + 2b + 3b = 0 Combine like terms: 2b + 3b = 5b -54 + 5b = 0 Solving -54 + 5b = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '54' to each side of the equation. -54 + 54 + 5b = 0 + 54 Combine like terms: -54 + 54 = 0 0 + 5b = 0 + 54 5b = 0 + 54 Combine like terms: 0 + 54 = 54 5b = 54 Divide each side by '5'. b = 10.8 Simplifying b = 10.8
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