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Simplifying 4x + 3.9 = x + 12 Reorder the terms: 3.9 + 4x = x + 12 Reorder the terms: 3.9 + 4x = 12 + x Solving 3.9 + 4x = 12 + 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. 3.9 + 4x + -1x = 12 + x + -1x Combine like terms: 4x + -1x = 3x 3.9 + 3x = 12 + x + -1x Combine like terms: x + -1x = 0 3.9 + 3x = 12 + 0 3.9 + 3x = 12 Add '-3.9' to each side of the equation. 3.9 + -3.9 + 3x = 12 + -3.9 Combine like terms: 3.9 + -3.9 = 0.0 0.0 + 3x = 12 + -3.9 3x = 12 + -3.9 Combine like terms: 12 + -3.9 = 8.1 3x = 8.1 Divide each side by '3'. x = 2.7 Simplifying x = 2.7
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