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42+3x =12
3x=12-42
3x=-30 I :3
x= -10
2. 0,5z +4 -z = -1
-0,5z +4 = -1
- 0,5z + -1 -4
-0,5z = -5 I: (- 0,5)
z = 10
Mam nadzieję ze pomogłam :D
3x=-30 /:(3)
x=-10
0,5z+4-z=-1
-0,5z=-5 /*2
-z=-10 /*(-1)
z=10