SOLUTION: A number plus it's fourth is 210. What is the number?

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Question 688017: A number plus it's fourth is 210. What is the number?
Answer by MathLover1(20849) About Me  (Show Source):
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A number x plus it's fourth x%2F4 is 210:
x%2Bx%2F4=210
4x%2F4%2Bx%2F4=210
5x%2F4=210
5x=210%2A4
5x=840
x=840%2F5
highlight%28x=168%29

check:
x%2Bx%2F4=210
168%2B168%2F4=210
168%2B42=210
210=210