x*2/5+4/3:8/15=2 9/10;
[tex] x\frac{2}{5}+ \frac{4}{3} : \frac{8}{15}=2 \frac{9}{10} \\ \\ \frac{2x}{5} +\frac{4}{3} * \frac{15}{8}= \frac{20*10+9}{10} \\ \\ \frac{2x}{5}+ \frac{5}{2} = \frac{29}{10} \\ \\ 4x+25=29 \\ \\ 4x=29-25 \\ \\ 4x=4 \\ \\ x=1[/tex]
x-12 1/2=3/4*x
[tex]x-12\frac{1}{2}= \frac{3x}{4} \\ \\ x- \frac{12*2+1}{2} = \frac{3x}{4} \\ \\ 4x-25*2=3x \\ \\ 4x-3x=50 \\ \\ x=50 [/tex]
