Question

Ajutor!!!! (7a +6) :3=30 ; (100-m:2) :5=13;

Answer 1

(7a +6) :3=30  
7a + 6 = 30 x 3 
7a + 6 = 90 
7a = 90 - 6 
7a = 84 
a = 84 : 7
a = 12

(100-m:2) :5=13
100 - m:2 = 13 x 5 
100 - m:2 = 65 
m :2 = 100 - 65 
M : 2 = 45 
m = 45 x 2 
m = 90