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Simplifying 21 + -6x = 7 + -8x Solving 21 + -6x = 7 + -8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8x' to each side of the equation. 21 + -6x + 8x = 7 + -8x + 8x Combine like terms: -6x + 8x = 2x 21 + 2x = 7 + -8x + 8x Combine like terms: -8x + 8x = 0 21 + 2x = 7 + 0 21 + 2x = 7 Add '-21' to each side of the equation. 21 + -21 + 2x = 7 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 7 + -21 2x = 7 + -21 Combine like terms: 7 + -21 = -14 2x = -14 Divide each side by '2'. x = -7 Simplifying x = -7
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