de calculat ecuatiile a) 3+x=28:4 b) 5(x+2)=32 c) 2a-3=17 va rog e urgent

Răspuns :

a) 3 + x = 28 : 4
3 + x = 7
x = 7 - 3
x = 4

b) 5(x + 2) = 32
x + 2 = 32 : 5
x + 2 = 6,4
x = 6,4 - 2
x = 4,4

c) 2a - 3 = 17
2a = 17 + 3
2a = 20
a = 20 : 2
a = 10