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3*(-4)-8= - 12-8=4
2*1/2-3*0=1-0=1
2.
7d+4-3d=0
4d=-4 /:4
d= - 1
3e-7-6e=8
-3e=8+7
-3e=15 /:(-3)
e= -5
5f-3-f=2
4f=5 /:4
f=5/4
f= 1,25