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Simplifying x + 15 + x + -12 = 90 Reorder the terms: 15 + -12 + x + x = 90 Combine like terms: 15 + -12 = 3 3 + x + x = 90 Combine like terms: x + x = 2x 3 + 2x = 90 Solving 3 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2x = 90 + -3 Combine like terms: 3 + -3 = 0 0 + 2x = 90 + -3 2x = 90 + -3 Combine like terms: 90 + -3 = 87 2x = 87 Divide each side by '2'. x = 43.5 Simplifying x = 43.5
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