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4 PS + 2 PT = 96
PS + PT = 40 / *- 4
4PS+2PT = 96
-4PS-4PT=-160
-2PT=-64/-2
PT=32
4PS+2*32=96
4PS=96-64
4PS=32/4
PS=8
4PS+2PT=96 |:2
PS+PT=40
2PS + PT= 48 |*(-1)
PS + PT = 40
-2PS - PT =-48
PS+ PT =40
________________
-PS = -8
8 + PT= 40
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4 PS + 2 PT = 96
PS + PT = 40 / *- 4
4PS+2PT = 96
-4PS-4PT=-160
-2PT=-64/-2
PT=32
4PS+2*32=96
4PS=96-64
4PS=32/4
PS=8
4PS+2PT=96 |:2
PS+PT=40
2PS + PT= 48 |*(-1)
PS + PT = 40
-2PS - PT =-48
PS+ PT =40
________________
-PS = -8
PS=8
8 + PT= 40
PT=32
PS=8
PT=32