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Simplifying 78 + x = 90 Solving 78 + x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-78' to each side of the equation. 78 + -78 + x = 90 + -78 Combine like terms: 78 + -78 = 0 0 + x = 90 + -78 x = 90 + -78 Combine like terms: 90 + -78 = 12 x = 12 Simplifying x = 12
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