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Simplifying -28 = 77(3x + 4) + 21x Reorder the terms: -28 = 77(4 + 3x) + 21x -28 = (4 * 77 + 3x * 77) + 21x -28 = (308 + 231x) + 21x Combine like terms: 231x + 21x = 252x -28 = 308 + 252x Solving -28 = 308 + 252x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-252x' to each side of the equation. -28 + -252x = 308 + 252x + -252x Combine like terms: 252x + -252x = 0 -28 + -252x = 308 + 0 -28 + -252x = 308 Add '28' to each side of the equation. -28 + 28 + -252x = 308 + 28 Combine like terms: -28 + 28 = 0 0 + -252x = 308 + 28 -252x = 308 + 28 Combine like terms: 308 + 28 = 336 -252x = 336 Divide each side by '-252'. x = -1.333333333 Simplifying x = -1.333333333
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