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Simplifying 2x + 5(12 + x) = 90 2x + (12 * 5 + x * 5) = 90 2x + (60 + 5x) = 90 Reorder the terms: 60 + 2x + 5x = 90 Combine like terms: 2x + 5x = 7x 60 + 7x = 90 Solving 60 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-60' to each side of the equation. 60 + -60 + 7x = 90 + -60 Combine like terms: 60 + -60 = 0 0 + 7x = 90 + -60 7x = 90 + -60 Combine like terms: 90 + -60 = 30 7x = 30 Divide each side by '7'. x = 4.285714286 Simplifying x = 4.285714286
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