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4x+5x-6x+7x=-4+5-2+3
10x=2 /10
x= 0,2
b) 5(x-7)+2=-28
5x-35+2=-28
5x=35-2-28
5x=5/5
x=1
c) 4(3-x) +9=7(2+x+29)
12-4x+9=14+7x+203
-4x-7x= 203+14-9-12
-11x= 196/(-11)
x=17,82
d) 2(x-3)+3(x-4)+4(x-5)=0
2x-6+3x-12+4x-20=0
2x+3x+4x= 6+12+20
9x=38/9
x=4,(9)
e) 2(x-1)+3(x+1)=26
2x-2+3x+3=26
2x+3x= 26+2-3
5x= 25/5
x= 5
f) 9=5x+6-5(x-6,6)
9= 5x+6-5x+33
-5x+5x=33+6-9
0x=30 brak rozw, równ. sprzeczne