600+m×40=7000 решить уравнение
600+m*40=7000; 600+40m=7000; 40m=7000-600; 40m=6400; m=6400:40; m=160
600 + 40m = 7000 40m = 7000-600 40m = 6300 m = 6300/40 m = 157.5