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Simplifying 345x + 285(42 + -1x) = 12990 345x + (42 * 285 + -1x * 285) = 12990 345x + (11970 + -285x) = 12990 Reorder the terms: 11970 + 345x + -285x = 12990 Combine like terms: 345x + -285x = 60x 11970 + 60x = 12990 Solving 11970 + 60x = 12990 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11970' to each side of the equation. 11970 + -11970 + 60x = 12990 + -11970 Combine like terms: 11970 + -11970 = 0 0 + 60x = 12990 + -11970 60x = 12990 + -11970 Combine like terms: 12990 + -11970 = 1020 60x = 1020 Divide each side by '60'. x = 17 Simplifying x = 17
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