exam Maths Puzzle Numerical Ability

-3/3-9/+2/-5-6/=

/this stands for a straight line

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exam Other Question

2(-3a=5)=4(a+4)


ii know the answer is 12 but idk how to get it
I've been having such a hard time with proofs lately, and now I have this huge packet due tomorrow full of them. Here's my question,

Given: Triangle GEC is congruent to Triangl