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-15 + 10 = -10 + 15
-5 = 5
(10 - 7) - 6 = 10 - (7 - 6)
10 - 7 -6 = 10 - 7 + 6
-3 - 9 = 3 + 9
-12 = 12
-15+10=(-10)+15
(-5) = 5
[10-7]-6=10-[7-6]
[10+(-7)] -6 = 10-[7+(-6)]
3-6 = 10-1
3+(-6) = 10+(-1)
(-3)=9
jika kurang diganti tambah, maka bilangan yg sebelumnya tetap dan bilangan yg sesudahnya berganti menjadi lawannya
contoh= a-b
= a+(-b)