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a+207.187+a+197.943+a=a+a+a+a

Răspuns :

a + 207.187+ a + 197.943 + a = a + a + a + a

3 × a + 207.187 + 197.943 = 4 × a

3 × a + 405.130 = 4 × a

4 × a - 3 × a = 405.130

a = 405.130