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2x=10+y |/2
x=5+1/2y
x+5y=-17 |-x
5y=-17-x |/5
y=-3.4- x/5
x+5y=-17
10x-5y=50
x+5y=-17
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11x =33/:11
x=3
2*3-y=10
6-y=10
y=10-6
y=4
x=3