Question

solve 3y − 7 = y + 5 and explain each step please so i understand

Answer 1

3y − 7 = y + 5

So first, make sure you have a variable on one side only.  Just subtract y from both sides.

2y - 7 = 5

Now, isolate the variable by adding 7 on both sides (inverse operations) to cancel the negative 7.

2y = 12

Finally, divide by the coefficient of the variable, in this case, 2.

y = 6

That's your answer (y = 6)!  Hope this helped! 

Answer 2

What you must do for this case is the clearance of the unknown y.
 We have then:
 Step 1:
 (3y - 7) - y = (y + 5) - y
 Step 2:
 2y-7 = 5
 Step 3:
 (2y-7) + 7 = (5) +7
 Step 4: 
 2y = 12
 Step 5:
 y = 12/2
 y = 6
 Answer:
 y = 6