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Simplifying 9x + 5 + 21x + -1 + 78 = 180 Reorder the terms: 5 + -1 + 78 + 9x + 21x = 180 Combine like terms: 5 + -1 = 4 4 + 78 + 9x + 21x = 180 Combine like terms: 4 + 78 = 82 82 + 9x + 21x = 180 Combine like terms: 9x + 21x = 30x 82 + 30x = 180 Solving 82 + 30x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-82' to each side of the equation. 82 + -82 + 30x = 180 + -82 Combine like terms: 82 + -82 = 0 0 + 30x = 180 + -82 30x = 180 + -82 Combine like terms: 180 + -82 = 98 30x = 98 Divide each side by '30'. x = 3.266666667 Simplifying x = 3.266666667
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