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Simplifying 4x + (x + -13) = 77 Reorder the terms: 4x + (-13 + x) = 77 Remove parenthesis around (-13 + x) 4x + -13 + x = 77 Reorder the terms: -13 + 4x + x = 77 Combine like terms: 4x + x = 5x -13 + 5x = 77 Solving -13 + 5x = 77 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 5x = 77 + 13 Combine like terms: -13 + 13 = 0 0 + 5x = 77 + 13 5x = 77 + 13 Combine like terms: 77 + 13 = 90 5x = 90 Divide each side by '5'. x = 18 Simplifying x = 18
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