exam Maths Puzzle Numerical Ability

Here's a problemm that I neeed help with.

1-x/21=3(x+11)

thanks for you're help

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exam Other Question

give three rays with d as initial point Line t is parallel to the line y=3x+2 and passes thru the highest point on the graph of y=x(10-x). What is the equation of t?

Thankyou for your help