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Simplifying 6x + (13 + -4x) = 21 Remove parenthesis around (13 + -4x) 6x + 13 + -4x = 21 Reorder the terms: 13 + 6x + -4x = 21 Combine like terms: 6x + -4x = 2x 13 + 2x = 21 Solving 13 + 2x = 21 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 + 2x = 21 + -13 Combine like terms: 13 + -13 = 0 0 + 2x = 21 + -13 2x = 21 + -13 Combine like terms: 21 + -13 = 8 2x = 8 Divide each side by '2'. x = 4 Simplifying x = 4
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