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Simplifying x + (2x) + (x + -7) = 77 Reorder the terms: x + (2x) + (-7 + x) = 77 Remove parenthesis around (-7 + x) x + (2x) + -7 + x = 77 Reorder the terms: -7 + x + (2x) + x = 77 Combine like terms: x + (2x) = 3x -7 + 3x + x = 77 Combine like terms: 3x + x = 4x -7 + 4x = 77 Solving -7 + 4x = 77 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 4x = 77 + 7 Combine like terms: -7 + 7 = 0 0 + 4x = 77 + 7 4x = 77 + 7 Combine like terms: 77 + 7 = 84 4x = 84 Divide each side by '4'. x = 21 Simplifying x = 21
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