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Simplifying 12 + x = 0.80(20 + x) 12 + x = (20 * 0.80 + x * 0.80) 12 + x = (16 + 0.80x) Solving 12 + x = 16 + 0.80x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.80x' to each side of the equation. 12 + x + -0.80x = 16 + 0.80x + -0.80x Combine like terms: x + -0.80x = 0.2x 12 + 0.2x = 16 + 0.80x + -0.80x Combine like terms: 0.80x + -0.80x = 0.00 12 + 0.2x = 16 + 0.00 12 + 0.2x = 16 Add '-12' to each side of the equation. 12 + -12 + 0.2x = 16 + -12 Combine like terms: 12 + -12 = 0 0 + 0.2x = 16 + -12 0.2x = 16 + -12 Combine like terms: 16 + -12 = 4 0.2x = 4 Divide each side by '0.2'. x = 20 Simplifying x = 20
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