Question

how could i solve this equation?
3m - 5 = 7m - 21

Answer 1

7m-3m=21-5
4m=16
m=4

Answer 2

what im trying to figure out is where the 4m =6 came from.

Answer 3

just move 7m to left side of equal n move 5 to right side of equal.. signs ll change

Answer 4

oh,i see now. thanks!

Answer 5

3m - 5 = 7m - 21
3m - 7m = -21 + 5
-4m = -16
m = -16/-4
= 4

Answer 6

Just isolate the variable on one side and keep changing the signs as you move the constants to the other side of the equation.