X-2y = 12
15x + 3y = -44
Elemination

x - 2y = 12eq(1)15x + 3y =-44eq(2)multiply the 1st equation by 15  therefore we get a new equation..and we mark it as 3rd eq15x - 30y = 180eq(3)15x + 3y =-44eq(2)now you can see (x) term in both the equations are the same...sothere is a law in elimination methodif the terms are equal we subtract the rest without the equaled termif the terms are different we add the rest without the different term so here term are equal so we subtracteq(3)-eq(2)-30y -3y = 180 -(-44)-33y = 224y = -224/33then let's get the answer for (x) term by substitute the answer we got for y to any of the above equation without our new equation (3)x - 2y = 12eq(1)x - 2 (-224/33) = 12x = -52/33answers x = -52/33y = -224/33

The clear answer is clearly 25 is very clear to me