book Maths Puzzle Numerical Ability

I need help figuring 2x + 3y = 6 (for x)

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book Other Question

Given f(x)=4x+1 and g(x)=x^2+1

Find: (f o g)(x)=

my answer was 4x^2+4 was I correct? how do you do 3/2 x/-27 and 9=t-8/4