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Simplifying 21 + -6x = 12 + -7x Solving 21 + -6x = 12 + -7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7x' to each side of the equation. 21 + -6x + 7x = 12 + -7x + 7x Combine like terms: -6x + 7x = 1x 21 + 1x = 12 + -7x + 7x Combine like terms: -7x + 7x = 0 21 + 1x = 12 + 0 21 + 1x = 12 Add '-21' to each side of the equation. 21 + -21 + 1x = 12 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 12 + -21 1x = 12 + -21 Combine like terms: 12 + -21 = -9 1x = -9 Divide each side by '1'. x = -9 Simplifying x = -9
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