Розв'яжіть систему рівнянь методом додавання
1) {4x-y=20, 3) {-5x+7y=2,
{4x+y=12; {8x+7y=15;
2) {9x+17y=52, 4) {9x-6y=24
{26x-17y=18; {9x+8y=10
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