exam Maths Puzzle Numerical Ability

help with this problem please...
0.4z-0.15=0.65-0.3(6-2z)

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exam Other Question

3x^2/2=-45 solve the system of equations:

4x-3y=8
2x+5y=-9

a.(-2,1)

b.(2,0)

c.(0,-83)

d.(1/2,-2)