Answer:
see explanation
Step-by-step explanation:
Given
c = (s + [tex]\frac{b}{3}[/tex]) m
There are 2 possible approaches
Approach 1
Divide both sides by m
[tex]\frac{c}{m}[/tex] = s + [tex]\frac{b}{3}[/tex]
Multiply both sides by 3 to clear the fraction
[tex]\frac{3c}{m}[/tex] = 3s + b ( subtract b from both sides )
[tex]\frac{3c}{m}[/tex] - b = 3s ( divide both sides by 3 )
[tex]\frac{3c}{3m}[/tex] - [tex]\frac{b}{3}[/tex] = s, cancelling the factor 3 gives
s = [tex]\frac{c}{m}[/tex] - [tex]\frac{b}{3}[/tex]
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Approach 2
Distribute the right side by m
c = ms + [tex]\frac{bm}{3}[/tex]
Multiply through by 3 to clear the fraction
3c = 3ms + bm ( subtract bm from both sides )
3c - bm = 3ms ( divide both sides by 3m )
[tex]\frac{3c}{3m}[/tex] - [tex]\frac{bm}{3m}[/tex] = s, thus
s = [tex]\frac{c}{m}[/tex] - [tex]\frac{b}{3}[/tex]