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
what percent of 50 is 36?

how do i solve this? find the first five terms in the expansion of (r-2s)^8, can somebody tell me how to find the coeffiecients. Thanks