book Maths Puzzle Numerical Ability

2
_x=-10
5
Two fifths x = -10

i wrote it out incase it did not come out looking right. Can I get help on this.

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book Other Question

What is the value of j in the equation? kthe square root of j+ the square root of j + 14=3 to the square root of j+10?Please help me? 7y=33-4y