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persamaan pertama
x > 0
-5 ( x - 7 ) + 2 = -13
-5x + 35 + 2 = -13
-5x = -37 - 13
-5x = -50
x = -50 / -5
x = 10
persamaan kedua
x < 0
-5 ( -x + 7 ) + 2 = -13
5x - 35 + 2 = - 13
5x - 33 = -13
5x = 33 - 13
x = 20 / 5
x = 4
penyelesaiannya adalah x = 10 dan x = 4
(-x + 2) - 3 = 7
persamaan pertama
x > 0
(-x + 2) - 3 = 7
-x +2 - 3 = 7
- x = 7 -2 + 3
-x = 8
x = 8 / -1
x = - 8
persamaan kedua
x < 0
(x - 2) - 3 = 7
x -2 -3 = 7
x = 7 + 2 + 3
x = 10
penyelesaiannya adalah x = - 8 & x = 10