Odpowiedź :
13-10x=-77
-10x=-77-13
-10x=-90 |:(-10)
x=9
5y+3=63
5y=63-3
5y=60 |:5
y=12
6(x-4)=54
6x-24=54 |:6
x-4=9
x=13
2(x+7)=-20
2x+14=-20 |:2
x+7=-10
x=-10-7
x=-17
-8x+5=30-13x
-8x+13x=30-5
5x=25 |:5
x=5
Licze na naj :))
13-10x=-77
-10x=-77-13
-10x=-90 |:(-10)
x=9
5y+3=63
5y=63-3
5y=60 |:5
y=12
6(x-4)=54
6x-24=54 |:6
x-4=9
x=13
2(x+7)=-20
2x+14=-20 |:2
x+7=-10
x=-10-7
x=-17
-8x+5=30-13x
-8x+13x=30-5
5x=25 |:5
x=5
Licze na naj :))