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Simplifying 161 = x + (7 + x) Remove parenthesis around (7 + x) 161 = x + 7 + x Reorder the terms: 161 = 7 + x + x Combine like terms: x + x = 2x 161 = 7 + 2x Solving 161 = 7 + 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. 161 + -2x = 7 + 2x + -2x Combine like terms: 2x + -2x = 0 161 + -2x = 7 + 0 161 + -2x = 7 Add '-161' to each side of the equation. 161 + -161 + -2x = 7 + -161 Combine like terms: 161 + -161 = 0 0 + -2x = 7 + -161 -2x = 7 + -161 Combine like terms: 7 + -161 = -154 -2x = -154 Divide each side by '-2'. x = 77 Simplifying x = 77
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