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Simplifying 31 + x + -15 + x = 189 Reorder the terms: 31 + -15 + x + x = 189 Combine like terms: 31 + -15 = 16 16 + x + x = 189 Combine like terms: x + x = 2x 16 + 2x = 189 Solving 16 + 2x = 189 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-16' to each side of the equation. 16 + -16 + 2x = 189 + -16 Combine like terms: 16 + -16 = 0 0 + 2x = 189 + -16 2x = 189 + -16 Combine like terms: 189 + -16 = 173 2x = 173 Divide each side by '2'. x = 86.5 Simplifying x = 86.5
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