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y= 65-9x
5x+3y=55
5x+3(65-9x)=55
5x+195-27x=55
195-55 = 27x-5x
140 = 22x
70/11 = x
9(70/11)+y = 65
630/11 + y = 65
630+11y = 715
11y = 85
y=85/11