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Simplifying 12 + 4.2x = 3x Solving 12 + 4.2x = 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 12 + 4.2x + -3x = 3x + -3x Combine like terms: 4.2x + -3x = 1.2x 12 + 1.2x = 3x + -3x Combine like terms: 3x + -3x = 0 12 + 1.2x = 0 Add '-12' to each side of the equation. 12 + -12 + 1.2x = 0 + -12 Combine like terms: 12 + -12 = 0 0 + 1.2x = 0 + -12 1.2x = 0 + -12 Combine like terms: 0 + -12 = -12 1.2x = -12 Divide each side by '1.2'. x = -10 Simplifying x = -10
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