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

Perform the indicated operation. 3rs(5r^2s-4rs+6rs^2) I think I came up with the right answer, but would love for someone to double-check my work! The problem reads: Solve

3a-5/a^2+4a+3 + 2a+2/a+3 = a-3/a+1

I came up with a = -6 or -1