how to do step by step
You essentially only have to perform one step in order to arrive at the solution to this equation:
x + 7 = 3
x + 7 - 7 = 3 - 7 (Subtract 7 from both sides in order to isolate the x on the left-hand side)
x + 0 = -4 (Remember that 3 - 7 will be a negative number)
x = -4 <== The answer.
Hassan H. (Raleigh, NC)