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=10x²-2-xy-4+x-y
=10x²-2-4-xy+x-y
=10x²-6-xy+x-y
a+ 1 per 3a -2+2_a per 5a
=a+1-3a-2+2-a-5a
=a-3a-a-5a+1-2+2
= -8a+1
semoga benar