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Simplifying 2x + 7b + -9x + 21c + 5x = 0 Reorder the terms: 7b + 21c + 2x + -9x + 5x = 0 Combine like terms: 2x + -9x = -7x 7b + 21c + -7x + 5x = 0 Combine like terms: -7x + 5x = -2x 7b + 21c + -2x = 0 Solving 7b + 21c + -2x = 0 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-21c' to each side of the equation. 7b + 21c + -21c + -2x = 0 + -21c Combine like terms: 21c + -21c = 0 7b + 0 + -2x = 0 + -21c 7b + -2x = 0 + -21c Remove the zero: 7b + -2x = -21c Add '2x' to each side of the equation. 7b + -2x + 2x = -21c + 2x Combine like terms: -2x + 2x = 0 7b + 0 = -21c + 2x 7b = -21c + 2x Divide each side by '7'. b = -3c + 0.2857142857x Simplifying b = -3c + 0.2857142857x
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