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Simplifying x(x + 4x) = 215 Combine like terms: x + 4x = 5x x(5x) = 215 Remove parenthesis around (5x) x * 5x = 215 Reorder the terms for easier multiplication: 5x * x = 215 Multiply x * x 5x2 = 215 Solving 5x2 = 215 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '5'. x2 = 43 Simplifying x2 = 43 Take the square root of each side: x = {-6.557438524, 6.557438524}
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