Question

Solve for c R=5(c/a-0.3)

Answer 1

we have

$R=5(c/a-0.3)$

Solve for c--------> that means that clear variable c

so

Divide by $5$ both sides

$R/5=(c/a-0.3)$

Adds $0.3$ both sides

$(R/5)+0.3=(c/a)$

Multiply by $a$ both sides

$a[(R/5)+0.3]=c$

so

$c=a[(R/5)+0.3]$

therefore

the answer is

$c=a[(R/5)+0.3]$

Answer 2

If i'm not wrong, your  answer should be: C= R/5a+0.3a