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Simplifying 3x + (x + -8) = 13 Reorder the terms: 3x + (-8 + x) = 13 Remove parenthesis around (-8 + x) 3x + -8 + x = 13 Reorder the terms: -8 + 3x + x = 13 Combine like terms: 3x + x = 4x -8 + 4x = 13 Solving -8 + 4x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 4x = 13 + 8 Combine like terms: -8 + 8 = 0 0 + 4x = 13 + 8 4x = 13 + 8 Combine like terms: 13 + 8 = 21 4x = 21 Divide each side by '4'. x = 5.25 Simplifying x = 5.25
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