Решите уравнения: 1) 23х - 13х + 4,83х = 7,9
2) 197х - 97х - 1,1 = 8,82
3) 7,8х + 992,2х - 0,5 = 9,1
4) 1,12х + 8,88х + 9,1 = 25,07
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