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3x-2y = -16 X2 = 6x-4y = -32 _
25y = 125
y = 125/25
= 5
2x+7(5) = 31<=> 2x+35 = 31 <=> 2x = 31-35 = -4
x = -4/2
= -2
maka, 2y-x = 2(5)-(-2)
= 10+2
= 12
BE HAPPY :D