a : 2 + a : 4 + a : 3 + 2890 = 3528
a:(2+4+3)+2890=3528
a:(2+4+3)=3528-2890
a:9=638
a=638*9
a=5742
a : 2 + a : 4 + a : 3 + 2890 = 3528
a:(2+4+3)+2890=3528
a:(2+4+3)=3528-2890
a:9=638
a=638*9
a=5742
x = 7656/13 nhaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
=>a:2+a:3+a:4=3528-2890=638
\(\Rightarrow\frac{a}{2}+\frac{a}{3}+\frac{a}{4}=638\Rightarrow\frac{6a}{12}+\frac{4a}{12}+\frac{3a}{12}=638\Rightarrow\frac{6a+4a+3a}{12}=638\)
=>13a=638.12=7656
=>a=7656:13
=>a=7656/13