exam Maths Puzzle Numerical Ability

solve the inequality

5q+7<3(q+1)

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exam Other Question

1/xy / 1/x+1/y I am having trouble solving these systems. I get lost somewhere in the middle and it becomes a mess. Please help.
x-2y-3z=4
2x-4y+5z=-3
5x-6y+4z=-7

and

2x-y=-1
-2x+z=1
y-z=0

Thank you.