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5x+4y=52
☆7x+y=59
y=59-7x
☆5x+4y=52
5x+4 (59-7x)=52
5x+236-28x=52
5x-28x=52-236
-23x=-184
x=-184/-23
x=8
☆7x+y=59
7 (8)+y=59
56+y=59
y=59-56
y=3