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Simplifying 7 * 0.3 + X * 0.7 = 4 Multiply 7 * 0.3 2.1 + X * 0.7 = 4 Reorder the terms for easier multiplication: 2.1 + 0.7X = 4 Solving 2.1 + 0.7X = 4 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-2.1' to each side of the equation. 2.1 + -2.1 + 0.7X = 4 + -2.1 Combine like terms: 2.1 + -2.1 = 0.0 0.0 + 0.7X = 4 + -2.1 0.7X = 4 + -2.1 Combine like terms: 4 + -2.1 = 1.9 0.7X = 1.9 Divide each side by '0.7'. X = 2.714285714 Simplifying X = 2.714285714
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