Question

Equação de 1° Grau 3,5x+1=3+3,1x 

Answer 1

3,5x+1=3+3,1x
3,5x - 3,1x = 3 -1
0,4x= 2
x= 2 
   0,4
x= 5

Answer 2

$3,5x+1 = 3 + 3,1x \\ 3,5x-3,1x+1-3 \\ 0,4x-2= 0 \\ 0,4x= 2 \\ x= \frac{2}{0,4} \\ \\ \\ \boxed{\boxed{x= 5}}$