exam Maths Puzzle Numerical Ability

Please Help Slove -15<5x-5<=5

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exam Other Question

1.8-12y^3/4
2.x-12=-8(x-3) Find values for m and b in the following system so that the solution to the system
is (-3,4).

5x+7y=b
mx+y=22

Please help!!
Thanks so much!!!