book Maths Puzzle Numerical Ability

I'm trying to find the answers to these problems. I need to simplify?

4(Z + 8) - Z
2(4Y + 6) - 3Y
3(X - 5) + 8X

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book Other Question

An employee of the computer store is paid a base salary of $1,175 per month plus a 5% commission on all sales during the month. How much must this employee sell in one month to earn a total of 3,170 for the month -7s-8=10s+1