Реши уравнения любым способом (r+5)*7-54=(r+5)*4

Question

Реши уравнения любым способом (r+5)*7-54=(r+5)*4

Comments

(r+5)*7-(r+5)*4=54; (r+5)*3=54; r+5=54:3; r+5=18; r=18-5; r=13

Answer 1

(r+5)*7-54=(r+5)*4
7(r+5)-4(r+5)=54
3(r+5)=54
3r+15=54
3r=54-15
3r=39
r=39:3
r=13

Answer 2

7r+35-54=4r+20
-39=-3r
r=13