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Simplifying 91 = x + (x + 13) Reorder the terms: 91 = x + (13 + x) Remove parenthesis around (13 + x) 91 = x + 13 + x Reorder the terms: 91 = 13 + x + x Combine like terms: x + x = 2x 91 = 13 + 2x Solving 91 = 13 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 91 + -2x = 13 + 2x + -2x Combine like terms: 2x + -2x = 0 91 + -2x = 13 + 0 91 + -2x = 13 Add '-91' to each side of the equation. 91 + -91 + -2x = 13 + -91 Combine like terms: 91 + -91 = 0 0 + -2x = 13 + -91 -2x = 13 + -91 Combine like terms: 13 + -91 = -78 -2x = -78 Divide each side by '-2'. x = 39 Simplifying x = 39
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