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-4y=-5-79
-4y=-84 //(-4)
y=21
Spr. 79=4x21-5
79=84-5
79=79
2. 4y+16=36
4y=36-16
4y=20 //:4
y=5
Spr. 4x5+16=36
20+16=36
36=36
3. 3x-4=2
3x=2+4
3x=6 //:3
x=2
Spr. 3x2-4=2
6-4=2
2=2
4. 2=3x-4
-3x=-4-2
-3x=-6 //:(-3)
x=2
2=3x2-4
2=6-4
2=2