▶13 - 2(x) - -7 = ?
? = 0
▶20 - 2(x)
Two is a negative
So, -2 = ?
Remember, that I said the mysterious number is '0' until we get to the REAL answer!
▶ (x) - 10 = 0
If we 'add' from your side we will get your result!
▶We have One Solution in this problem◀
⚠So, lets test it out⚠
✔ x - 10 = 0
+10
-------
✔10✔
▶✅x = 10✅