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Simplifying 3x + (-1x) = 13 Combine like terms: 3x + (-1x) = 2x 2x = 13 Solving 2x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '2'. x = 6.5 Simplifying x = 6.5
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