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Simplifying 18 + 0.70x = 0.80(20 + x) 18 + 0.70x = (20 * 0.80 + x * 0.80) 18 + 0.70x = (16 + 0.80x) Solving 18 + 0.70x = 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. 18 + 0.70x + -0.80x = 16 + 0.80x + -0.80x Combine like terms: 0.70x + -0.80x = -0.1x 18 + -0.1x = 16 + 0.80x + -0.80x Combine like terms: 0.80x + -0.80x = 0.00 18 + -0.1x = 16 + 0.00 18 + -0.1x = 16 Add '-18' to each side of the equation. 18 + -18 + -0.1x = 16 + -18 Combine like terms: 18 + -18 = 0 0 + -0.1x = 16 + -18 -0.1x = 16 + -18 Combine like terms: 16 + -18 = -2 -0.1x = -2 Divide each side by '-0.1'. x = 20 Simplifying x = 20
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