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x =
2x + 3y = 8
2 () + 3y = 8
+ 3y = 8
----------------------------------------------------- x3
34 - 4y + 9y = 24
34 + 5y = 24
5y = 24 - 34
5y = - 10
y =
= - 2
3x + 2y = 17
3x + 2 (-2) = 17
3x + -4 = 17
3x = 17 + 4
3x = 21
x = 21/3 = 7
x + y = 7 + -2 = 5