Hello there,
6m+4=8m. Change so that all the numbers stuck to m are on the rights side of the equal sign and regular numbers on the left of the equal sign. So,
6m-6m+4=8m-6m --> 4=2m. Divide 4 to 2, therefore, 2=m. MUltiply for to each side, so 8=4m.
Hope this helps!!