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Simplifying 15 = 4.3x + -2.1x + 8.4 Reorder the terms: 15 = 8.4 + 4.3x + -2.1x Combine like terms: 4.3x + -2.1x = 2.2x 15 = 8.4 + 2.2x Solving 15 = 8.4 + 2.2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.2x' to each side of the equation. 15 + -2.2x = 8.4 + 2.2x + -2.2x Combine like terms: 2.2x + -2.2x = 0.0 15 + -2.2x = 8.4 + 0.0 15 + -2.2x = 8.4 Add '-15' to each side of the equation. 15 + -15 + -2.2x = 8.4 + -15 Combine like terms: 15 + -15 = 0 0 + -2.2x = 8.4 + -15 -2.2x = 8.4 + -15 Combine like terms: 8.4 + -15 = -6.6 -2.2x = -6.6 Divide each side by '-2.2'. x = 3 Simplifying x = 3
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