first solve 7(15m+1) : * 7x15m=105m *7x1= 7
then multiply 5m(7)= 35m
35m=105m+7 .. So thats what you have
Move '105m' w/ 35m so it should look like this:
-105m+35m=7 (sign changes)
now subract -105m+35m since the signs are different u subtract and then take the sign of the larger number:
-70m=7
edit: so now u kno 5m(7)=7(15m+1) dont equal w/ each other.. then if u wanna solve for 'm' u move '-70' to the other side and divide w/ 7 to isolate 'm'