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Simplifying 12 = x + 4 + 7x Reorder the terms: 12 = 4 + x + 7x Combine like terms: x + 7x = 8x 12 = 4 + 8x Solving 12 = 4 + 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. 12 + -8x = 4 + 8x + -8x Combine like terms: 8x + -8x = 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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