2a(3 - b) - 3b(a - 2) - 5(ab + a + b)=6a-2ab-3ab+6b-5ab-5a-5b=a+b-10ab
1,5+(-2,6)-10*1,5*(-2,6)=-1,1+39=37,9
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2a(3 - b) - 3b(a - 2) - 5(ab + a + b)=6a-2ab-3ab+6b-5ab-5a-5b=a+b-10ab
1,5+(-2,6)-10*1,5*(-2,6)=-1,1+39=37,9