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Simplifying 21 + -7x = 1 + -8x Solving 21 + -7x = 1 + -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 + -7x + 8x = 1 + -8x + 8x Combine like terms: -7x + 8x = 1x 21 + 1x = 1 + -8x + 8x Combine like terms: -8x + 8x = 0 21 + 1x = 1 + 0 21 + 1x = 1 Add '-21' to each side of the equation. 21 + -21 + 1x = 1 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 1 + -21 1x = 1 + -21 Combine like terms: 1 + -21 = -20 1x = -20 Divide each side by '1'. x = -20 Simplifying x = -20
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