Answer:

Step-by-step explanation:
you need to cross multiple
For a;

For b;

If my calculations are incorrect, then sorry ;/
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2a
3c
4b
Cross multiply for 2
Put 4x-5=3x-10 and subtract 3 on both sides. After that add 10 to both sides for 3
Divide everything by 5 and multiply everything by -2 for 4