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Simplifying 2.1x + -3.5 = 4.2x Reorder the terms: -3.5 + 2.1x = 4.2x Solving -3.5 + 2.1x = 4.2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.2x' to each side of the equation. -3.5 + 2.1x + -4.2x = 4.2x + -4.2x Combine like terms: 2.1x + -4.2x = -2.1x -3.5 + -2.1x = 4.2x + -4.2x Combine like terms: 4.2x + -4.2x = 0.0 -3.5 + -2.1x = 0.0 Add '3.5' to each side of the equation. -3.5 + 3.5 + -2.1x = 0.0 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + -2.1x = 0.0 + 3.5 -2.1x = 0.0 + 3.5 Combine like terms: 0.0 + 3.5 = 3.5 -2.1x = 3.5 Divide each side by '-2.1'. x = -1.666666667 Simplifying x = -1.666666667
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