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Simplifying 13 + -3(x + -5) = 21 Reorder the terms: 13 + -3(-5 + x) = 21 13 + (-5 * -3 + x * -3) = 21 13 + (15 + -3x) = 21 Combine like terms: 13 + 15 = 28 28 + -3x = 21 Solving 28 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + -3x = 21 + -28 Combine like terms: 28 + -28 = 0 0 + -3x = 21 + -28 -3x = 21 + -28 Combine like terms: 21 + -28 = -7 -3x = -7 Divide each side by '-3'. x = 2.333333333 Simplifying x = 2.333333333
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