(0.5х+12)-(3.6-4.5х)=(4.8-0.3х)+(10.5х+0.6)
=Неверный формат== ------------
0.5х+12-3.6+4.5х=4.8-0.3х+10.5х+0.6 0.5х+4.5х+0.3х-10.5х=4.8+0.6-12+3 -5.2х=-3.6 х=-3.6÷-5.2≈0.69