This is the problem 12x^{2 +}_{ }14x=0
Look for a common factor.
12x^{2}+14x=0 has a common factor or 2x
2x(6x+7)=0
Or you can solve for x
12x^{2}+14x = 0 can be rearranged to:
12x^{2}=-14x
divide both sides by 2x reduces to:
6x = -7
divide both sides by 6 gives:
x = -7/6 or -1.166......
Hope this is what your looking for.