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2√5 * 3√5 = 2*3*√5*√5 = 6*5= 30
√7 * 3√7 = 3*√7*√7 = 3*7 = 21
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1. 3xy - 6x = 3x(y-2)
2. 2x + x - 3y = 3x - 3y = 3(x-y)
3. 6x²y - 3xy = 3xy(2x-1)