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Simplifying 78x + 90x + -20 = 180 Reorder the terms: -20 + 78x + 90x = 180 Combine like terms: 78x + 90x = 168x -20 + 168x = 180 Solving -20 + 168x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + 168x = 180 + 20 Combine like terms: -20 + 20 = 0 0 + 168x = 180 + 20 168x = 180 + 20 Combine like terms: 180 + 20 = 200 168x = 200 Divide each side by '168'. x = 1.19047619 Simplifying x = 1.19047619
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