exam Maths Puzzle Numerical Ability

I have been struggling with this math problem for awhile now and I was wondering if anyone could help me? I would deeply appreciate it!! Please and Thank You!!

Adding and Subtracting Polynomials
Solve.
3-2x(x-1)=x(3-2x)-(x-3)

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exam Other Question

can you help me solve

4x^2≥13x-3

here is my answer: (-∞,3)u (3,1) im having a difficult time solving this kind of problem

5x-2y=4
x+2y=8

it says to solve each equation by the addition menthod (*you may have to multiply both sides by -1)

if you can show me the steps and explain them to me thanks.