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Simplifying 4 = 21x + 13 Reorder the terms: 4 = 13 + 21x Solving 4 = 13 + 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. 4 + -21x = 13 + 21x + -21x Combine like terms: 21x + -21x = 0 4 + -21x = 13 + 0 4 + -21x = 13 Add '-4' to each side of the equation. 4 + -4 + -21x = 13 + -4 Combine like terms: 4 + -4 = 0 0 + -21x = 13 + -4 -21x = 13 + -4 Combine like terms: 13 + -4 = 9 -21x = 9 Divide each side by '-21'. x = -0.4285714286 Simplifying x = -0.4285714286
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