Răspuns:
Explicație pas cu pas:
a)10x+2x/3-8/9=8/3⇒30x+2x=2+8⇒32x=10⇒x=10/32⇒x=5/16⇒x≅0,31
c)x+21x/10+x/2-4/10=392/100⇒100x+210x+50x-40=392⇒360x=432⇒x=432/360⇒x=1,19