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∫2x+9y=-9
∫-3x+3y=8
∫2x=-9-9y //:2
∫-3x+3y=8
∫x=-4,5-4,5y
∫-3x+3y=8
∫x=-4,5-4,5y
∫-3(-4,5-4,5y) +3y=8
∫x=-4,5-4,5y
∫13,5+13,5y +3y=8
∫x=-4,5-4,5y
∫16,5y=-5,5 //:16,5
∫x=-4,5-4,5y
∫y= -1/3
x=3