How can we say in German, "I agree, I don't agree/ I disagree (with sb/sth)'?

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If you are in a discussion and you want to agree you can say for "I agree (with sb.).": "Ich stimme (jemandem) zu." or for "I don't agree (with sb.).": "Ich stimme (jemandem) nicht zu.".

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agreed = einverstanden
Ich bin mit dir einverstanden.

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Ich stimme ihr zu (I agree with her) Ich stimme ihr nicht zu (I don't agree with her)