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(9x+y=33 /*2
(5x-2y=26
(18x+2y=66 +
-------------------
23x=92 //:23
x=4
(x=4
(5*4-2y=26
(x=4
(20-2y=26
(x=4
(-2y=26-20
(x=4
(-2y=6 //:(-2)
(x=4
(y=-3