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$$F/(ma) = 1$$ $$E/(mc^2) = 1$$ $$U/(RI) = 1$$ etc, I think you get the point :) Probably you ask this, because many equations are preferred in the form "= 0". Why this is advantageous is probably what you wanted... or should have wanted to ask, right?
Sure. For example: $$\varepsilon_0\cdot \mu_0 \cdot c^2 = 1$$ with the electric and magnetic field constants and the speed of light.