Solving for add./sub. equation with same exponents, different bases

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The exponent term is the same, while the bases are different. Can I simplify this for an addition/subtraction equation?

$$2^{(1-r)} + 9(1.6^{(1-r)}) - 3.85^{(1-r)} - 9(0.1^{(1-r)}) = 0 $$