#(6b(a^2b)^2)/(t(2k)^2)-:(3(ab)^2)/(2kt^2)^3#
#:.=(6b(a^2b)^2)/(t(2k)^2) xx ((2kt^2)^3)/(3(ab)^2)#
#:.=(6b(a^4b^2))/(t(4k^2)) xx (8k^3t^6)/(3a^2b^2)#
#:.=(6a^4b^3)/(4k^2t) xx (8k^3t^6)/(3a^2b^2)#
#:.=(6a^(4-2)b^(3-2))/4 xx (8k^(3-2)t^(6-1))/3#
#:.=(cancel6^color(blue)2a^2b)/cancel4^color(blue)1 xx (cancel8^color(blue)2kt^5)/cancel3^color(blue)1#
#:.=(2a^2b)/1 xx (2kt^5)/1#
#:.=2a^2b xx 2kt^5#
#:.color(blue)(=4a^2bkt^5#