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Simplifying -0.3x + 2.1(x + -4) = 6.6 Reorder the terms: -0.3x + 2.1(-4 + x) = 6.6 -0.3x + (-4 * 2.1 + x * 2.1) = 6.6 -0.3x + (-8.4 + 2.1x) = 6.6 Reorder the terms: -8.4 + -0.3x + 2.1x = 6.6 Combine like terms: -0.3x + 2.1x = 1.8x -8.4 + 1.8x = 6.6 Solving -8.4 + 1.8x = 6.6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.4' to each side of the equation. -8.4 + 8.4 + 1.8x = 6.6 + 8.4 Combine like terms: -8.4 + 8.4 = 0.0 0.0 + 1.8x = 6.6 + 8.4 1.8x = 6.6 + 8.4 Combine like terms: 6.6 + 8.4 = 15 1.8x = 15 Divide each side by '1.8'. x = 8.333333333 Simplifying x = 8.333333333
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