book Maths Puzzle Numerical Ability

can u help me on this problem 5(x-7)=5

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book Other Question

Please help me solve this problem. -7i+6i
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9-4i Two trains start toward each other on parallel tracks at the same time from towns 450 miles apart. One train travels 6 mph faster than the other train. What is the rate of each train if they meet in 5 hours?
thanks for the help!