book Maths Puzzle Numerical Ability

i am stumped i have an answer but it seems way off
0.7x-(6-.5x)=.48
i have the answer as 8.54 but i rounded

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book Other Question

(x+7)(x-1)=(x+1)Squared Write the product below in simplest form without parentheses:

(y + 4) (y - 2)