Question

12x-3=3(x+1)+4

Answer 1

I'm guessing we are solving for x?

Answer 2

yes

Answer 3

x = 10/9

See numerical solver (x=1.111111):

http://www.hackmath.net/en/calculator/solving-system-of-linear-equations?input=12x-3%3D3%28x%2B1%29%2B4&submit=Calculate

Answer 4

which means the final equation is
9x=10
divide by 9 on each side
x=1.1