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Pensar = I "think" in that moment. Achar = I "guess" that is correct. With "Pensar" you use your brain to think in something. "Achar" is normally used to "find" something, but in Portuguese we use as substitute to "guess". Ela achou o objeto = She found the object. Eu acho essa música chata = I find this music boring. Acho que está certo = I guess that is correct.