Question 294159
m = h - 4

h + 3 = 2(m + 3)
Substitute (h - 4) for m
{{{ h + 3 = cross(2(h - 4 + 3)) = 2h - 2 }}} <br>
Subtract 3 from each side:
{{{ h + cross(3 - 3) = 2h - cross(2 - 3)5 }}}

2h - 5 = h = 5
5 - 4 = 1
m = 1<br>
Heidi is 5
Molly is 1 
& bob's your uncle!