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Simplifying 15 = 2.1 + 0.8x Solving 15 = 2.1 + 0.8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8x' to each side of the equation. 15 + -0.8x = 2.1 + 0.8x + -0.8x Combine like terms: 0.8x + -0.8x = 0.0 15 + -0.8x = 2.1 + 0.0 15 + -0.8x = 2.1 Add '-15' to each side of the equation. 15 + -15 + -0.8x = 2.1 + -15 Combine like terms: 15 + -15 = 0 0 + -0.8x = 2.1 + -15 -0.8x = 2.1 + -15 Combine like terms: 2.1 + -15 = -12.9 -0.8x = -12.9 Divide each side by '-0.8'. x = 16.125 Simplifying x = 16.125
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