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3x ilosc zlotuwek-19*3=57
95 razem
2x+3x=95
5x=95|:5
x=19
19+57=76
7) x banknoty 50zlotowe 40
x+10 banknoty 200zl 40+10=50
kwota 12000zl
200*(x+10)-kwota w banknotach 200zl
50*x-kwota w banknotach 50zl
200(x+10)+50x=12000
200x+50x=10000
250x=10000|:250
x=40
8) x waga cegły
4x+6=6x+2
4x-6x=2-6
-2x=-4|:-2
x=2kg
b)x waga cegły
x=1/2x+1
x-1/2x=1
1/2x=1|:1/2
x=2kg