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2x=19-7
2x=12//:2
x=6
b) 2x-3+x=-3+3x
2x+x-3x=-3+3
0=0
c)2(x-1)+3(x-2)=7
2*x-2*1+3*x-3*2=7
2x-2+3x-6=7
2x+3x=7+2+6
5x=15//:5
x=3
d)x- ---- = 2x+3
3
x-3=2x+3
x+2x=3+3
3x=6//:3
x=2
e)---- =4
3
x-5 2x-1
przykro mi ale przykładu "e" nie rozumiem
f) 2x- ----- =2+ ---------
2 3
2x-3=2+2
2x=2+2+3
2x=7//:2
x=3,5
g) ------ + ------ - -------- = 13
2 6 9
6+9-2=13
15-2=13