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