Ex 3: x•(2+a+b)=32;a+b=6;x•(2+6)=32;x•8=32;x=32:8=4;ex 4. 82x:41=60;2x=60;
x=60:2=30; ex 7: (x+y+z):3=28; x+y+z=28•3=84; ex. 8. : 297•298:2 -3= 150x ;88506:2-3=150x;44253-3=150x;44250=150x;x=44250:150=295.ex 9. :
a-b=43;a=2b-44; 2b-44-b=43; b-44=43;b=44+43=87;a=87•2-44=174-44=130; verificare:130-87=43.
Sper că te-am ajutat