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Simplifying 7.4 = 2.1(3 + 4x) 7.4 = (3 * 2.1 + 4x * 2.1) 7.4 = (6.3 + 8.4x) Solving 7.4 = 6.3 + 8.4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8.4x' to each side of the equation. 7.4 + -8.4x = 6.3 + 8.4x + -8.4x Combine like terms: 8.4x + -8.4x = 0.0 7.4 + -8.4x = 6.3 + 0.0 7.4 + -8.4x = 6.3 Add '-7.4' to each side of the equation. 7.4 + -7.4 + -8.4x = 6.3 + -7.4 Combine like terms: 7.4 + -7.4 = 0.0 0.0 + -8.4x = 6.3 + -7.4 -8.4x = 6.3 + -7.4 Combine like terms: 6.3 + -7.4 = -1.1 -8.4x = -1.1 Divide each side by '-8.4'. x = 0.130952381 Simplifying x = 0.130952381
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