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x+x-5=7
2x-5=7
2x=12
x=6
tapi cara kedua aq agak bingung tapi aq coba, mungkin gini
-x+(-x)+5=7
-2x=2
x=-1
2x-5=7 2x-5=-7
2x=12 2x=-2
x=6 x=-1
HP={-1,6}