exam Maths Puzzle Numerical Ability

I am retunning to school after 15 years and I am having problems with Algebra. Please help me to understand how to simplify equations.
4x+7-15x+50-11+12x

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exam Other Question

One hundred people attend the Wild West Snake Rodeo, and the admission receipts come to $100. Tickets are $5 per man, $2 per woman, and 10 cents per child. How many men, women, and children attended? If g(x) is an inverse of f(x)then how do the ordinate and abscissa coordinates on the points of f(x) map onto coordinates of g(x)?