Odpowiedź :
9x+(-6)=48
9x=48-(-6)
9x=48+6
9x=54/:9
x=6
8x+(-6)=42
8x=42-(-6)
8x=42+6
8x=48/:8
x=6
5x+(-3)=27
5x=27-(-3)
5x=27+3
5x=30
x=6
77=9x+(-4)
77-(-4)=9x
77+4=9x
81/:9=9x
x=9
-6+9×=12
9x=12+6
9x=18/:9
x=2
5x-8=37
5x=37+8
5x=45/:5
x=9
6+7x=-50
7x=-50-6
7x=-56/:7
x=8
10x-3=57
10x=57+3
10x=60/:10
x=6
21=6x+(-3)
21-(-3)=6x
21+3=6x
24/:6=6x
x=4