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3x - 4y = 17 x2
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15y = -12
-8y = 34
----------------- -
23y = -46
y = -46/23 = -2
2x + 5 (-2) = -4
2x -10 = -4
2x = 6
x = 3
2(3) - 3(-2)
6 + 6 = 12
maaf kalo salah. semoga membantu