Question

6(r+10)+3(2r-7)= -45

Answer 1

Resolvemos :

6(r + 10) + 3(2r - 7) = - 45

6r + 60 + 6r - 21 = - 45

6r + 6r + 60 - 21 = - 45
 
   12r + 39 = - 45
 
   12r = - 45 - 39
 
   12r = - 84

     r = - 84/12
  
     r = - 7

Answer 2

6r+60+6r-21=-45
12r+39=-45
12r=-45-39
12r=-84

El valor de r= -7