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Simplifying 7x + 11 + 11x + 7 = 90 Reorder the terms: 11 + 7 + 7x + 11x = 90 Combine like terms: 11 + 7 = 18 18 + 7x + 11x = 90 Combine like terms: 7x + 11x = 18x 18 + 18x = 90 Solving 18 + 18x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 18x = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 18x = 90 + -18 18x = 90 + -18 Combine like terms: 90 + -18 = 72 18x = 72 Divide each side by '18'. x = 4 Simplifying x = 4
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