Răspuns:
Explicație pas cu pas:
a) ...⇔24·(3x-1)-20·(5x+1)=15·(x+1)-3·120, ⇔72x-24-100x-20=15x+15-360, ⇔72x-100x-15x=15-360+24+20, ⇔-43x=-301 ⇔x=-301:(-43)⇔x=7.
b) ...⇔20·(4x+1)-12·(3x-1)=15·60-15·(25-x) ⇔80x+20-36x+12=900-375+15x ⇔ 80x-36x-15x=900-375-20-12 ⇔29x=493, ⇔x=493:29 ⇔x=17.
