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+
-2y=-8 /:(-2)
y=4
2x-4=-10
2x=-6 /:2
x=-3
b) +
-4x=-20 /:(-4)
x=5
5+2y=-8
2y=-13
y=-13/2
c)
+
x=17
3x+y=16
3x-16=y
3*17- 16=y
y= 51-16
y=35
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