Explanation:
x = y - 3
4x = 6y + 10
let's multiply the first equation by -4 and then add both equations :
-4x = -4y + 12
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0 = 2y + 22
2y + 22 = 0
2y = -22
y = -22/2 = -11
x = y - 3 = -11 - 3 = -14
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