Розв'яжіть систему рівнянь способом додавання:
1) (3x+4y=-14 5x-4y = 30
2) (3x+4y = -20 (5x + 2y = -10
3) {6(x+ 2(x-4)=7y - 25 :+3) − 5(y + 2) = −11
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