0,13(9,8х+5,4)+1,2(4,5х+1)=15
0,13*9,8х+0,13*5,4+1,2*4,5х+1,2*1=15
1,274х+0,702+5,4х+1,2=15
1,274х+5,4х=15-0,702-1,2
6,674х=13,098
х=1,962
0,13(9,8х+5,4)+1,2(4,5х+1)=15
0,13*9,8х+0,13*5,4+1,2*4,5х+1,2*1=15
1,274х+0,702+5,4х+1,2=15
1,274х+5,4х=15-0,702-1,2
6,674х=13,098
х=1,962