Still -245y + 875x. You can't perform operation to the numbers whose variables are not the same.

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The answer is -245y + 875xRemember that you cannot add nor subtract terms with different variables. You just always add or subtract terms that contain the same variables. For instance, you can add 40x and 60x because they have the same variable which is x; while, you cannot add 40x and 60y because they have different variables.