найдите корни уравнений
1.(x-16)*5=420
2.(16+x)*20=680
3.(200-x)*6=1140
4.(x+30)*110=7700

1.(x-16)*5=420 5x - 80 = 4205x = 420 + 805x = 500x = 500 : 5x = 1002.(16+x)*20=680320 + 20x = 68020 x = 680 - 32020 x = 360x = 360 : 20x = 183.(200-x)*6=11401200 -6x = 1140-6x = 1140 - 1200-6x = - 60x = 104.(x+30)*110=7700110x + 3300 = 7700110x = 7700-3300110x = 4400x = 40