4(x+20)=6x
раскроем скобки
4x+80 = 6x
-2x+80 = 0
2x-80 = 0
2x = 80
x = 40
6(x+20)=4x
6x+120 = 4x
2x+120 = 0
2x = -120
x = -60
4(x+20)=6x
раскроем скобки
4x+80 = 6x
-2x+80 = 0
2x-80 = 0
2x = 80
x = 40
6(x+20)=4x
раскроем скобки
6x+120 = 4x
2x+120 = 0
2x = -120
x = -60