2*3^x+1-4*3^x-2=150, 2*3*3^x-4*3^x/9=150, 2*27*3^x-4*3^x=1350, 3^x*(54-4)=1350, 3^x*50=1350, 3^x=27, 3^x=3^3, x=3
2*3^x+1-2*3^2-x=56, 2*(3^x*3-9/3^x)=56, 3*3^x-9/3^x=28, 3*3^2x-9=28*3^x, 3*3^2x-28*3^x=9, 3^x*(3*3^2-28)=9, 3^x*(27-28)=9, -3^x=9, -3^x=(-3)^2, x=2
