Question

1/2(4a+10b) = c      solve for b

Answer 1

1/2 (4a + 10b) = c

Multiply each side by 2 : 4a + 10b = 2c

Subtract 4a from each side: 10b = 2c - 4a

Divide each side by 10 : b = 1/5 c - 2/5 a

Answer 2

`(1)/(2)(4a+10b)=c \\\\ (1)/(2)*2(2a+5b)=c \\\\ 2a+5b=c \\\\ 5b=c-2a \\\\ \boxed{b=(c-2a)/(5)}`