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Simplifying 0.25x + 0.15(20 + -1x) = 4.2 0.25x + (20 * 0.15 + -1x * 0.15) = 4.2 0.25x + (3 + -0.15x) = 4.2 Reorder the terms: 3 + 0.25x + -0.15x = 4.2 Combine like terms: 0.25x + -0.15x = 0.1x 3 + 0.1x = 4.2 Solving 3 + 0.1x = 4.2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 0.1x = 4.2 + -3 Combine like terms: 3 + -3 = 0 0 + 0.1x = 4.2 + -3 0.1x = 4.2 + -3 Combine like terms: 4.2 + -3 = 1.2 0.1x = 1.2 Divide each side by '0.1'. x = 12 Simplifying x = 12
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