Răspuns :
5x + 2 = 22
5x = 20
x = 4
19 + 7x = 89
7x = 70
x = 10
72 - 2x = 36
2x = 36
x = 18
2(x + 1) = 81
2x + 2 = 81
2x = 79
x = 39,5
5x = 20
x = 4
19 + 7x = 89
7x = 70
x = 10
72 - 2x = 36
2x = 36
x = 18
2(x + 1) = 81
2x + 2 = 81
2x = 79
x = 39,5
5x =22-2
5x=20
x=4
7x=89-19
7x=70
x =10
-2x=36-72
-2x=-36
x= -36 : (-2)
x= 18
2x+2=81
2x=81-2
2x=79
x=39,5
5x=20
x=4
7x=89-19
7x=70
x =10
-2x=36-72
-2x=-36
x= -36 : (-2)
x= 18
2x+2=81
2x=81-2
2x=79
x=39,5