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Simplifying 13x + -1(x + 21) = 39 Reorder the terms: 13x + -1(21 + x) = 39 13x + (21 * -1 + x * -1) = 39 13x + (-21 + -1x) = 39 Reorder the terms: -21 + 13x + -1x = 39 Combine like terms: 13x + -1x = 12x -21 + 12x = 39 Solving -21 + 12x = 39 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 12x = 39 + 21 Combine like terms: -21 + 21 = 0 0 + 12x = 39 + 21 12x = 39 + 21 Combine like terms: 39 + 21 = 60 12x = 60 Divide each side by '12'. x = 5 Simplifying x = 5
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