Question

3.(x - 6) = (2x + 1).5 - 8.9

Answer 1

Resolver:
3.( x - 6) = (2x + 1).5 - 8.9
3x - 18 = 10x + 5 -72
- 18 + 72-5 =10x - 3x
49 = 7x
49/7 = x
7 = x

Solucion:
x = 7

Answer 2

$3(x-6) = (2x+1)5 - 8.9 \\ \\ 3x - 18 = 10x + 5 - 72 \\ \\ -18 -5 +72 = 10x -3x \\ \\ 49 = 7x \\ \\ \frac{49}{7} = x \\ \\ \boxed{7=x }$

Espero que te sirva, salu2!!!!