a) x+5(12+31·2)=1042
x+5·74=1042
x=1042-370
x=672.
b) 49+2x=x+79
2x-x=79-49
x=30.
c) 3(273-42·5)-x=56
3(273-210)-x=56
3·63-x=56
-x=56-189
-x=-133
x=133.
d) 10(639-75·8)+x=232·11
10(639-600)+x=2552
10·39+x=2552
x=2552-390
x=2162.
Sper ca te-am ajutat :)
