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Simplifying 7 + 42x = 21x + (13) 7 + 42x = 21x + 13 Reorder the terms: 7 + 42x = 13 + 21x Solving 7 + 42x = 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. 7 + 42x + -21x = 13 + 21x + -21x Combine like terms: 42x + -21x = 21x 7 + 21x = 13 + 21x + -21x Combine like terms: 21x + -21x = 0 7 + 21x = 13 + 0 7 + 21x = 13 Add '-7' to each side of the equation. 7 + -7 + 21x = 13 + -7 Combine like terms: 7 + -7 = 0 0 + 21x = 13 + -7 21x = 13 + -7 Combine like terms: 13 + -7 = 6 21x = 6 Divide each side by '21'. x = 0.2857142857 Simplifying x = 0.2857142857
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