15. [tex]\frac{x}{5} - g = a[/tex]
Add "g" on both sides
[tex]\frac{x}{5} = a +g[/tex]
Multiply 5 on both sides to get x by itself
x = 5(a + g)
x = 5a + 5g
18. a = 3n + 1
Subtract 1 on both sides
a - 1 = 3n
Divide 3 on both sides to get n by itself
[tex]\frac{a - 1}{3} = \frac{a}{3} -\frac{1}{3}[/tex] = n
21. M = T - R
Add "R" on both sides to get "T" by itself
M + R = T
24. 5p + 9c = p
Subtract "5p" on both sides
9c = p - 5p
9c = -4p
Divide 9 on both sides to get "c" by itself
c = [tex]\frac{-4p}{9}[/tex] or c = [tex]\frac{-4}{9} p[/tex]
27. 4y + 3x = 5
Subtract "4y" on both sides
3x = 5 - 4y
Divide 3 on both sides to get "x" by itself
x = [tex]\frac{5-4y}{3}[/tex]
x = [tex]\frac{5}{3} -\frac{4y}{3}[/tex]
