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Simplifying (20x + -4) + (16x + 5) + 77 = 180 Reorder the terms: (-4 + 20x) + (16x + 5) + 77 = 180 Remove parenthesis around (-4 + 20x) -4 + 20x + (16x + 5) + 77 = 180 Reorder the terms: -4 + 20x + (5 + 16x) + 77 = 180 Remove parenthesis around (5 + 16x) -4 + 20x + 5 + 16x + 77 = 180 Reorder the terms: -4 + 5 + 77 + 20x + 16x = 180 Combine like terms: -4 + 5 = 1 1 + 77 + 20x + 16x = 180 Combine like terms: 1 + 77 = 78 78 + 20x + 16x = 180 Combine like terms: 20x + 16x = 36x 78 + 36x = 180 Solving 78 + 36x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-78' to each side of the equation. 78 + -78 + 36x = 180 + -78 Combine like terms: 78 + -78 = 0 0 + 36x = 180 + -78 36x = 180 + -78 Combine like terms: 180 + -78 = 102 36x = 102 Divide each side by '36'. x = 2.833333333 Simplifying x = 2.833333333
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