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Simplifying (2x + -11) + x + 4 = 21 Reorder the terms: (-11 + 2x) + x + 4 = 21 Remove parenthesis around (-11 + 2x) -11 + 2x + x + 4 = 21 Reorder the terms: -11 + 4 + 2x + x = 21 Combine like terms: -11 + 4 = -7 -7 + 2x + x = 21 Combine like terms: 2x + x = 3x -7 + 3x = 21 Solving -7 + 3x = 21 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 + 3x = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 3x = 21 + 7 3x = 21 + 7 Combine like terms: 21 + 7 = 28 3x = 28 Divide each side by '3'. x = 9.333333333 Simplifying x = 9.333333333
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