Explanation:
Given that:
2(x + 3) = x - 4
Multiply the number outside of the brackets with numbers in the bracket on LHS.
⇛2x + 6 = x - 4
Shift all variables on LHS and constant on RHS, changing it's sign.
⇛2x - x = -4 -6
Subtract the number on LHS and RHS.
x = -10
Therefore, x = -10
Please let me know if you have any other questions.