Решите систему уравнений: а)у=2х+5, 2х+3у=31, б)5x-7y=-24, х=-3у+4, В)2х+5у=-8, 2х+3у=-4, г)-3х+7у=29, 6х+5у=13, Д)3х+7у=-5, 5х+4у=7. если решишь всё то 40 балов дам
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