exam Maths Puzzle Numerical Ability

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

ii know the answer is 12 but idk how to get it

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exam Other Question

Determine if F(x) = (1/3)x-3 and g(x)= 3x+9 are inverse functions by computing their comositions. -3/3-9/+2/-5-6/=

/this stands for a straight line