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Answer 1 · 2017-03-25T12:56:53

Is this what you are asking?

$\frac{3}{10} (a - 10) + (\frac{3}{4} a - 6) \frac{2}{5}$ $3/10(a-10)+(3/4a-6)2/5$

Answer 2 · 2017-03-25T13:26:34

$\frac{3}{10} (a - 10) + (\frac{3}{4} a - 6) 2 = \frac{9}{5} a - 15$ $3/10(a-10)+(3/4a-6)2 = color(green)(9/5a-15)$

I've made some assumptions (as noted by others).

$\frac{3}{10} (a - 10) + (\frac{3}{4} a - 6) 2$ $color(red)(3/10(a-10))+color(blue)((3/4a-6)2$

$color(white)("XXX")=color(red)((3a-30)/10)+color(blue)((3a-24)/(cancel(4)_2)cancel2)$

$color(white)("XXX")=color(red)((3a-30)/10) +color(blue)((15a-120)/10)$

$color(white)("XXX")=(18a-150)/10$

$color(white)("XXX")=9/5a-15$