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2x-6+3y-15=4x-4-3y+21
2x-21=4x+17
2x-4x=21+17
-2x=38 |:-2
x=-19
2(x+y)-5(y-x)=3(2x-y)+5(5x-3y)
2x+2y-5y+5x=6x-3y+25x-15y
7x-3y=31x-18y
7x-31x=-18y+3y
-24x=-15y