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Simplifying 7x + 13 + 42 = 90 Reorder the terms: 13 + 42 + 7x = 90 Combine like terms: 13 + 42 = 55 55 + 7x = 90 Solving 55 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-55' to each side of the equation. 55 + -55 + 7x = 90 + -55 Combine like terms: 55 + -55 = 0 0 + 7x = 90 + -55 7x = 90 + -55 Combine like terms: 90 + -55 = 35 7x = 35 Divide each side by '7'. x = 5 Simplifying x = 5
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