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6x + 15 dengan -3x - 6 = 9x + 21 ⇒⇒ di kurang
B. (6x - 5y -2z) + (-8x + 6y + 9z)
-2x + y + 7z
6x +15 -(-3x -6)
6x +15 +3x +6
6x +3x +15 +6
9x +21
Kalau ditambah
6x +15 +(-3x -6)
6x +15 -3x -6
6x -3x +15 -6
3x +9
b. (6x -5y -2z) +(-8x +6y +9z)
6x -5y -2z -8x +6y +9z
6x -8x -5y +6y -2z +9z
-2x +y +7z