(2,275 \(\times\) a + 2,743 \(\times\) a) - 2020 = 2021 \(\times\) ( 37 \(\times\)98 - 49\(\times\)74)
a \(\times\) ( 2,275 + 2,743) - 2020 = 2021 \(\times\) ( 3626 - 3626)
a \(\times\) 5,018 - 2020 = 2021 \(\times\) 0
a \(\times\) 5,018 - 2020 = 0
a \(\times\) 5,018 = 2020
a = 2020 : 5,018
a ≈ 402,55