Question

8x+6(x-1)=3(4x+1)

Answer 1

first to the multiplications:
8x+6x-6=12x+3

rearrange all the unknowns on one side numbers on the other side:
8x+6x-12x=6+3

Then just add/subtract:
2x=9

Since the unknown has to be by itself, you need to divide both sides by 2:
2x/2=9/2

which equals....
x=4.5

and voila! :D