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Simplifying 13 = (3 + 5x) + -2 + -1(2x + 5) Remove parenthesis around (3 + 5x) 13 = 3 + 5x + -2 + -1(2x + 5) Reorder the terms: 13 = 3 + 5x + -2 + -1(5 + 2x) 13 = 3 + 5x + -2 + (5 * -1 + 2x * -1) 13 = 3 + 5x + -2 + (-5 + -2x) Reorder the terms: 13 = 3 + -2 + -5 + 5x + -2x Combine like terms: 3 + -2 = 1 13 = 1 + -5 + 5x + -2x Combine like terms: 1 + -5 = -4 13 = -4 + 5x + -2x Combine like terms: 5x + -2x = 3x 13 = -4 + 3x Solving 13 = -4 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 13 + -3x = -4 + 3x + -3x Combine like terms: 3x + -3x = 0 13 + -3x = -4 + 0 13 + -3x = -4 Add '-13' to each side of the equation. 13 + -13 + -3x = -4 + -13 Combine like terms: 13 + -13 = 0 0 + -3x = -4 + -13 -3x = -4 + -13 Combine like terms: -4 + -13 = -17 -3x = -17 Divide each side by '-3'. x = 5.666666667 Simplifying x = 5.666666667
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