0.41/6x-25=12.5/15
0.41=12.5/15 * (6x-25)
-12.5/15 * (6x-25) + 0.41=0
-5/6 * (6x-25) + 0.41=0
-5/6 * 6x - 5/6 * (-25) + 0.41=0
-5x + 125/6 + 41=0
-5x + 0.41*6+25/6=0
-5x + 127.46/6=0
-5x + 12746/600=0
-5x + 6373/300=0
-5x*300+6373=0
-1500x+6373=0
1500x=6373
X=6373/1500
(x≈4,2487)