Answer :
With two x's combine the two 15x+(-4x) making a positive 11x-24=-79 then you add 24 to -79 because you switch the sign and add to the other side making it 11x=-55 then with the x you are trying to solve for your going do the opposite of 11 TIMES x and divide both sides giving your answer of x=-5
Combine like terms. Like 15x-4x and move the -24 on the other side and the sign of it will change. So it will be 15x-4x= -79+24
11x= -55
11x/11= -55/11
Cancelation. And the answer will be
X= -5
11x= -55
11x/11= -55/11
Cancelation. And the answer will be
X= -5
