book Maths Puzzle Numerical Ability

g(x)=-x^2+x-5

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Any idea how I might start trying to solve this one?

if w = 10, x = 5.5 y = 4 and z = 3

How might I try to solve the equation:

aw + bx +cy + dz = 140.

All suggestions much appreciated plese help need 6x=3x^2 need help with problem need to slove and graph