First, multiply each side of the equation by #color(red)(6)# to solve eliminate the fractions while keeping the equation balanced:
#color(red)(6) xx (2h - 6)/6 = color(red)(6) xx 2/3#
#cancel(color(red)(6)) xx (2h - 6)/color(red)(cancel(color(black)(6))) = cancel(color(red)(6))2 xx 2/color(red)(cancel(color(black)(3)))#
#2h - 6 = 4#
Next, add #color(red)(6)# to each side of the equation to isolate the #h# term while keeping the equation balanced:
#2h - 6 + color(red)(6) = 4 + color(red)(6)#
#2h - 0 = 10#
#2h = 10#
Now, divide each side of the equation by #color(red)(2)# to solve for #h# while keeping the equation balanced:
#(2h)/color(red)(2) = 10/color(red)(2)#
#(color(red)(cancel(color(black)(2)))h)/cancel(color(red)(2)) = 5#
#h = 5#