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8x-5y=-26 ...... II (-2)
25x-10y = -70
-16x+10y = +52
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9x = -18
x = -18/9
x = -2 ......III
III en I
5x-2y = -14
5(-2) -2y = -14
-10 - 2y = -14
-10+14 = 2y
4 = 2y
4/2 = y
2 = y
CS = ( -2; 2)