Question

x plus 1 supra 2 egal x supra 3

Answer 1

x + 1  = x 
   2        3
3(x + 1) = 2x
3x - 2x = - 3
x = - 3

Answer 2

$\displaystyle \frac{x+1}{2} = \frac{x}{3} \\ 3(x+1)=2x \\ 3x+3=2x \\ 3x-2x=-3 \\ x=-3$