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2. 5x+2y= 9
(-2) -4x + 8y = +4
(-4)-20x -8y = -36
-24x = -32
x = 32/24
x = 4/3
"x" en 1
2x-4y= -2
2(4/3) - 4y= -2
8/3+2= 4y
14/3 = 4y
y= 7/6