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how does one go about storing the ERC20 balance value of a contract in a local variable, with the ultimate purpose of using this value for later calculations within the same function?

uint256 varName = ERC20Object.balanceOf(this);

if done locally within a function it will always return 0 regardless of the ERC20Object balance being e.g. 1k-100mil. How to fix this and have varName show the correct number instead of 0?

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