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Simplifying 12 + -8x = 21 + -9x Solving 12 + -8x = 21 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 12 + -8x + 9x = 21 + -9x + 9x Combine like terms: -8x + 9x = 1x 12 + 1x = 21 + -9x + 9x Combine like terms: -9x + 9x = 0 12 + 1x = 21 + 0 12 + 1x = 21 Add '-12' to each side of the equation. 12 + -12 + 1x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 1x = 21 + -12 1x = 21 + -12 Combine like terms: 21 + -12 = 9 1x = 9 Divide each side by '1'. x = 9 Simplifying x = 9
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