its an equation
but seriously
3x*4=50
divvy up the sides by 4
3x*4 = 50/4
/4
3x=12.5
then by three
x=$${\frac{{\mathtt{12.5}}}{{\mathtt{3}}}} = {\frac{{\mathtt{25}}}{{\mathtt{6}}}} = {\mathtt{4.166\: \!666\: \!666\: \!666\: \!666\: \!7}}$$
if youre quick with mental math you can see
3x*4 = 3*4x and then do
x=50/12 and get the same answer but im not :\