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5a(a-3)-3a(a-5)=5a²-15a-3a²+15a=2a²
3x(x+1/3y)-2y(1/2x-1/2)= 3x²+xy-xy+y=3x²+y
5a²-15a-3a²+15a=2a²
3x²+xy-xy+y=3x²+y
5a(a-3)-3a(a-5) = 5a²-15a-3a²+15a = 2a²
3x(x+1/3y)-2y(1/2x-1/2) = 3x²+xy-xy+y = 3x²+y