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Simplifying 100 = 20 + x + -0.2x Combine like terms: x + -0.2x = 0.8x 100 = 20 + 0.8x Solving 100 = 20 + 0.8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8x' to each side of the equation. 100 + -0.8x = 20 + 0.8x + -0.8x Combine like terms: 0.8x + -0.8x = 0.0 100 + -0.8x = 20 + 0.0 100 + -0.8x = 20 Add '-100' to each side of the equation. 100 + -100 + -0.8x = 20 + -100 Combine like terms: 100 + -100 = 0 0 + -0.8x = 20 + -100 -0.8x = 20 + -100 Combine like terms: 20 + -100 = -80 -0.8x = -80 Divide each side by '-0.8'. x = 100 Simplifying x = 100
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