Simplifying equations in Maple

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I am using maple (version 12) for the first time.

I want to invert the equations using any maths tool. I tried it using MAPLE.

I have given two equations in this form:

a=x*b^r + y*(b^s)*(c^t)  +  z*c^u

Now I want to flip this equation (invert this equation)

I want two equations for a and b in terms of c

e.g

a= 0.98989c^2 + 78c + 87

b= 56c + 89

These are not my results. I just gave an example.

Any advice?

My two equations are:

Equation#1 is:

a= 1.093*(b^0.002939) - 0.1887*(b^0.7637)*(c^0.2306) - 0.04425 *(c^0.9143)

Equation#2 is:

a= 1.088*(b^0.003058) -0.1813*(b^0.7627)*(c^0.2501) -0.03958 *(c^0.9365)

From Equation#1, i can find b equation. I put the bequation in Equation#2 . In this way equation#2 has only a and c variables. i can get a equation. and then by putting this equation can get b equation ( with only c variables)

But these equations are very complex and it takes a lot of time to evaluate in MAPLE. How to simplify it? I tried to use natural log, but it doesnot give any answer. It just repeat my equation in command window.

ln(1.093*b^0.2939e-2-.1887*b^.7637*c^.2306-0.4425e-1*c^.9143)

Please guide me.

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