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Simplifying 12 + 9x(3x) = 90 Remove parenthesis around (3x) 12 + 9x * 3x = 90 Reorder the terms for easier multiplication: 12 + 9 * 3x * x = 90 Multiply 9 * 3 12 + 27x * x = 90 Multiply x * x 12 + 27x2 = 90 Solving 12 + 27x2 = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 27x2 = 90 + -12 Combine like terms: 12 + -12 = 0 0 + 27x2 = 90 + -12 27x2 = 90 + -12 Combine like terms: 90 + -12 = 78 27x2 = 78 Divide each side by '27'. x2 = 2.888888889 Simplifying x2 = 2.888888889 Take the square root of each side: x = {-1.699673171, 1.699673171}
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