book Maths Puzzle Numerical Ability

144+G=78 I am learning solving equations by addind or subtracting numbers

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book Other Question

I need to evalute the expression:

y^4/9(y^-4/9 + 4y ^5/9)

any help with this,i cant make sense of it or solve it. I need to multiply and assume all numbers are positive.

Thanks for your help -7n-10=4