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Simplifying 9x + 12 = x + 4 Reorder the terms: 12 + 9x = x + 4 Reorder the terms: 12 + 9x = 4 + x Solving 12 + 9x = 4 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 12 + 9x + -1x = 4 + x + -1x Combine like terms: 9x + -1x = 8x 12 + 8x = 4 + x + -1x Combine like terms: x + -1x = 0 12 + 8x = 4 + 0 12 + 8x = 4 Add '-12' to each side of the equation. 12 + -12 + 8x = 4 + -12 Combine like terms: 12 + -12 = 0 0 + 8x = 4 + -12 8x = 4 + -12 Combine like terms: 4 + -12 = -8 8x = -8 Divide each side by '8'. x = -1 Simplifying x = -1
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