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Simplifying 7x + 2(5 + 2x) = 87 7x + (5 * 2 + 2x * 2) = 87 7x + (10 + 4x) = 87 Reorder the terms: 10 + 7x + 4x = 87 Combine like terms: 7x + 4x = 11x 10 + 11x = 87 Solving 10 + 11x = 87 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 11x = 87 + -10 Combine like terms: 10 + -10 = 0 0 + 11x = 87 + -10 11x = 87 + -10 Combine like terms: 87 + -10 = 77 11x = 77 Divide each side by '11'. x = 7 Simplifying x = 7
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