Question

500-(x+ 138)+59=70
(78-x)+34=2030-45

Answer 1

500-(x+138)=70-59

x+138=500-11

x=489-138

x=351

(78-x)=1985-34

78-x=1951

x=78-1951

x=-1873

verificare

78-(-1873)+34=1985

78+1873+34=1985

1985=1985