(1/3+1/2)*х=3.75  и еше одно   уровнение( 3/5 - 0.25)*х=4.9

 (1/3+1/2)*х=3.75 (2/6+3/6)*х=375/1005/6х=15/4х=15/4:5/6х=15/4*6/5х=3/2*3/1х=9/2=4 целых 1/2( 3/5 - 0.25)*х=4.9(0,6-0,25)*х=4.90,35х=4.9х=4,9:0,35х=14