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x=-3
5y=13 /:5
y=13/5
7x=35-7
7x=28 /:7
x=4
w 2 dzialaniu wyjdzie y= 2,6
w 3 dzialaniu wyjdzie x = 4
-x+2x = -3
x = -3
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5y=13 | :5
y = 13/5
y = 2,6
------------------------------------
7x+7=35 (przerzucam)
7x=35-7
7x=28 | :7
x=4