9*radical(3)/2 = 4.5*radical(3) = 7.794 approx.
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-6/9 = -2/3
It is: (2+9)/3 = 3 and 2/3
2√20 - 3√7 - 2√5 + 4√63 = 2√(4 x 5) - 3√7 - 2√5 + 4√(9 x 7) = 4√5 - 2√5 - 3√7 + 12√7 = 2√5 + 9√7
9 and 3/4 divided by 2/3 equals 14.625
2/3 ÷ 3/10 = 2/3 × 10/3 = 20/9 = 2 2/9