Решите систему уравнений способом подстановки:
а) {х = 4+5у,
{4х-3у = -1;
б) {у = 3х - 3,
{3х - 2у = 0;
в) {х - 2у = 0,
{2х - 3у = 7;
г) {2х = 3у,
{3х - 2у = 5.
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