3x-0.4(5-2x)=5.6 how do i figure this out

First, you need to distribute in the parentheses.
-0.4(5 - 2x) = -2 + 0.8x

Next, you simplify.
3x - 2 + 0.8x = 5.6
3.8x - 2 = 5.6

Then you try to isolate x (by adding 2 to both sides of the equation in this place, then dividing by 3.8).
3.8x - 2 = 5.6
+2 +2
3.8x = 7.6
/3.8 /3.8
x = 2

You’re final answer is x=2

3x - 0.4(5-2x)= 5.6

First multiply -0.4(5 -2x) which is -2 + 0.8x

Now we have 3x -2 + 0.8x = 5.6

Then add 3x + 0.8x which is 3.8x and plug it back in which is 

3.8x - 2 = 5.6
         -2     -2

3.8x = 3.6 and divide both sided by 3.8

and the answer is x = 0.94736842105

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