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Simplifying 30 + 4x + 12 = 90 Reorder the terms: 30 + 12 + 4x = 90 Combine like terms: 30 + 12 = 42 42 + 4x = 90 Solving 42 + 4x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 4x = 90 + -42 Combine like terms: 42 + -42 = 0 0 + 4x = 90 + -42 4x = 90 + -42 Combine like terms: 90 + -42 = 48 4x = 48 Divide each side by '4'. x = 12 Simplifying x = 12
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