3x+7=19
-7 -7
which cancels out 7 and leaves you with
3x=12
you then divide both sides by 3 to get
x=4
1/2x-1=5
+1 +1
which cancels out 1 and leaves you with
1/2x = 6
you then divide both sides by 1/2 leaving you with
x=12
sorry if this answer is a little late
