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Simplifying 4x + 9x + -77 = 66 Reorder the terms: -77 + 4x + 9x = 66 Combine like terms: 4x + 9x = 13x -77 + 13x = 66 Solving -77 + 13x = 66 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '77' to each side of the equation. -77 + 77 + 13x = 66 + 77 Combine like terms: -77 + 77 = 0 0 + 13x = 66 + 77 13x = 66 + 77 Combine like terms: 66 + 77 = 143 13x = 143 Divide each side by '13'. x = 11 Simplifying x = 11
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