exam Maths Puzzle Numerical Ability

What is the absolute value of this fraction : (6x+2)/(x-1) all set equal to 4?

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exam Other Question

there are 20 people in a room. 8 of them are wearing socks and 13 of them are wearing shoes. 4 people are wearing both.how many are barefooted? If there are 6 * 10^9 people on the Earth and there is enough freshwater
to provide each person with 8.79 * 10^5 L, how much freshwater is on the
Earth?