let ' a number ' = x
twice a number = 2x
The sum of 2x and three = 2x + 3
...equals five: 2x + 3 = 5
Find the number
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2x + 3 = 5
Isolate the x. Do the opposite of PEMDAS. Note that because of the equal sign, what you do to one side, you do to the other.
Subtract 3 from both sides
2x + 3 (-3) = 5 (-3)
2x = 5 - 3
2x = 2
divide 2 from both sides
2x/2 = 2/2
x = 2/2
x = 1
x = 1 is your answer
hope this helps
