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2x -8y = 57 |×2
4x + 3y = 17
4x -16y = 171
___________-
19y = 154
y = 8.1
4x + 3y = 17
4x × 3×8,1 = 17
4x = 17 - 24.3
4x = - 7,3
x = -1,825