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Simplifying -1 = 8 + 21x Solving -1 = 8 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -1 + -21x = 8 + 21x + -21x Combine like terms: 21x + -21x = 0 -1 + -21x = 8 + 0 -1 + -21x = 8 Add '1' to each side of the equation. -1 + 1 + -21x = 8 + 1 Combine like terms: -1 + 1 = 0 0 + -21x = 8 + 1 -21x = 8 + 1 Combine like terms: 8 + 1 = 9 -21x = 9 Divide each side by '-21'. x = -0.4285714286 Simplifying x = -0.4285714286
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