Question

5x+20=57
how do I solved

Answer 1

You subtract 20 from both sides to give you:
5x=37
now you divide them both by 5 to give you:
x=7 2/5
or
x=7.4

Hope this helps :)

Answer 2

I hope this helps you 5x+20=57 5x=57-20 5x=37 x=37/5