4/15*(1,5+3)-0,77*(8/11х-3/7)

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Let's solve this step by step:

First, let's simplify the expression within the parentheses
1.5 + 3 = 4.5

Next, let's multiply 4.5 by 4/15
4.5 * 4/15 = 18/15 = 1.2

Now, let's simplify the expression within the second set of parentheses
(8/11)x - 3/7

Next, we multiply 0.77 by (8/11)x
0.77 * 8/11x = 6.16/11x

Then, we multiply 0.77 by -3/7
0.77 * -3/7 = -2.31/7

Now, we subtract -2.31/7 from 6.16/11x
6.16/11x - 2.31/7 = (42.76/77)x - 2.31/7 = (42.76x/77) - (2.31/7)

Finally, we subtract step 2 from step 6
1.2 - (42.76x/77) + (2.31/7) = 1.2 - 42.76x/77 + 0.33

Therefore, the simplified expression is 1.2 - (42.76x/77) + 0.33.