Решите эти системы уравнений методом алгебраического сложения.
а)
{
2
x

y
=
7
,
x
=
3
+
y
.
{2x−y=7,x=3+y.
б)
{
x
=
2
y
+
1
,
2
x
+
4
y
=
18
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