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Simplifying 21x + 99 = 7 + -21x Reorder the terms: 99 + 21x = 7 + -21x Solving 99 + 21x = 7 + -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. 99 + 21x + 21x = 7 + -21x + 21x Combine like terms: 21x + 21x = 42x 99 + 42x = 7 + -21x + 21x Combine like terms: -21x + 21x = 0 99 + 42x = 7 + 0 99 + 42x = 7 Add '-99' to each side of the equation. 99 + -99 + 42x = 7 + -99 Combine like terms: 99 + -99 = 0 0 + 42x = 7 + -99 42x = 7 + -99 Combine like terms: 7 + -99 = -92 42x = -92 Divide each side by '42'. x = -2.19047619 Simplifying x = -2.19047619
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