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-3x + y = 14
-3x + 5y = 34
Multiply the first equation by a negative
-(-3x+y=14) yields 3x - y = -14
Add the second equation to the first
3x + -3x + -y + 5y = -14 + 34
Combine like terms
4y = 20
y = 5
Substitute y into the first equation
-3x + 5 = 14
-3x = 14 - 5
-3x=9
x=-3
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