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Simplifying 6 = -15 + -21x Solving 6 = -15 + -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. 6 + 21x = -15 + -21x + 21x Combine like terms: -21x + 21x = 0 6 + 21x = -15 + 0 6 + 21x = -15 Add '-6' to each side of the equation. 6 + -6 + 21x = -15 + -6 Combine like terms: 6 + -6 = 0 0 + 21x = -15 + -6 21x = -15 + -6 Combine like terms: -15 + -6 = -21 21x = -21 Divide each side by '21'. x = -1 Simplifying x = -1
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