Question

10r+2*(7r-2)=5*(4r+3)+3r

Answer 1

10r + 14r - 4 = 20r +15 + 3r
24r - 20r - 3r = 15 + 4
r = 19

Answer 2

10r+14r-4=20r+15+3r; 10r+14r-20r-3r=15+4;4r=20; 20/4=5

Answer 3

ой 19 получается