\(a:2+a:4+a:3+2890=3528\)
\(\Leftrightarrow a:\left(2+4+3\right)=3528-2890\)
\(\Leftrightarrow a:9=638\Rightarrow a=638.9=5742\)
\(\frac{a}{2}+\frac{a}{4}+\frac{a}{3}=3528-2890=638\)
\(\frac{6a}{12}+\frac{3a}{12}+\frac{4a}{12}=638\)
\(\frac{13a}{12}=638\)
\(13a=7656\)
\(a=588,923....\)
a : 2 + a : 4 + a : 3 + 2890 = 3528
a : (2 + 4 + 3) + 2890 = 3528
a : 9 + 2890 = 3890
a : 9 = 3890 - 2890
a : 9 = 1000
a = 1000 * 9
a = 9000
