Plzzz pomóżcie
6x-2x-4=20
5x-3-2x-4=20
5x+3-2x+4=13
7x+16-3x-9=27
2*5x-12=5
8y-7,3=-34,6
12x:3-4+2x=20,6
3/4x-5+1/4x=10​