afla numerele necunoscute din expresiile:b)2+bx9-25=40;c).(c-104+2)x5+3=98;d).(dx4+20):4=12;f)11-(7x5-9x9:f:3):8=7;g)22-5x(38-4xg)=12;h)26+(6xh-7x3):9=27