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Simplifying 12 + 2.1x = 1.3x Solving 12 + 2.1x = 1.3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.3x' to each side of the equation. 12 + 2.1x + -1.3x = 1.3x + -1.3x Combine like terms: 2.1x + -1.3x = 0.8x 12 + 0.8x = 1.3x + -1.3x Combine like terms: 1.3x + -1.3x = 0.0 12 + 0.8x = 0.0 Add '-12' to each side of the equation. 12 + -12 + 0.8x = 0.0 + -12 Combine like terms: 12 + -12 = 0 0 + 0.8x = 0.0 + -12 0.8x = 0.0 + -12 Combine like terms: 0.0 + -12 = -12 0.8x = -12 Divide each side by '0.8'. x = -15 Simplifying x = -15
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