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2. (2y +15z) - (4y - 8) = 2y +15z - 4y + 8 = -2y + 15z + 8
3. (5z + 3) - ( 2z - 7) = 5z + 3 - 2z + 7 = 3z + 10
4. (x - y) - (6x + 4) = x - y - 6x - 4 = - 5x - y - 4
5x +3 -x +1
5x -x +3 +1
4x +4
2. Dibalik dahulu, sehingga
(2y +15z) -(4y -8)
2y +15z -4y +8
2y -4y +15z +8
-2y +15z +8
3. (5z +3) -(2z -7)
5z +3 -2z +7
5z -2z +3 +7
3z +10
4. Dibalik dahulu, sehingga
(x -y) -(6x +4)
x-y -6x -4
x -6x -y -4
-5x -y -4