four solutions for each of the following equations
2x + y = 7
x= 4y
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2x + y = 7
x = 4y
2 (4y) + y = 7
8y + y = 7
9y = 7
y = 7/9
x = 4y
x = 4 (7/9)
x = 28/9
x = 4y
2 (4y) + y = 7
8y + y = 7
9y = 7
y = 7/9
x = 4y
x = 4 (7/9)
x = 28/9
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