7th grade math
posted by holiday .
2x+7=4x+3 ?
3x+6=5x+1 ?
2n+6=8N+3 ?
6N+9=9n+6 ?

If you can do one, you can do them all:
2x+7=4x+3 we want x terms alone on the left so subtract 4x from both sides
2x + 7 = 3 we want the numbers alone on the right so subtract seven from both sides
2x = 4 we want the coefficient of x to be one so divide both sides by 2
x = 2
now check
2(2) + 7 = 4(2) + 3 ????
4 + 7 = 8 + 3 ???
11 = 11 sure enough 
2x+7=4x+3
You need to get the knowns on one side of the equation and the unknowns on the other side.
Subtract 2x from both sides.
7 = 2x + 3
Subtract 3 from both sides.
4 = 2x
Divide both sides by 2
4/2 = x
2 = x
Do the others the same way.