exam Maths Puzzle Numerical Ability

sorry i cant seem to figure this one out
SOLVE FOR X

0.1x-0.01(10-x)+0.01(100-x)=19

Thanks ALOT

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exam Other Question

A psychologist interested in political behavior measured the square footage of the desks in the official office of four U.S. governors and of four chief executive officers (CEOs) o Coefficients are to ____ as exponents are to ____?

I believe it terms and factors..