Respuesta :
infinite solutions
expand and simplify the right side of the equation
3 + 5n = 5n + 10 - 7
3 + 5n = 5n + 3
Since both sides of the equation are equal then any value of n will make the equation true.
Thus there are an infinite number of solutions.
[tex]3+5n=5(n+2)-7\\\\ 3+5n=5n+10-7\\\\ 3=3\\\\ x\in \mathbb{R}[/tex]