Решите систему уравнений:
1) {4x+y=2y-4
{3x+y=x+1

2) {2(4x-3)-3(4y+2)=0
{4x-4(y-3)=20

3) {4(x+1)-2(y+5)=1
{5(7-x)+4(y-2)=10
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