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2x+5x-x=2+4
6x=6/:6
x=1
b) -3+2x-6=2x-12
2x-2x=-12+3+6
0=-3
układ sprzeczny
c) 7x+2=5+3x+9
7x-3x=5+9-2
4x=12/:4
x=3
d) -5x+12+x=2x-12
-5x+x-2x=-12-12
-6x=-24/:(-6)
x=4
7x-4=x+2_______/-x
6x-4=2_______/+4
6x=6_______/:6
x=1
b) -3+2x-6=2x-12
-9+2x=2x-12_______/-2x
-9=-12
równanie sprzeczne (brak rozwiązań)
c) 7x+2=5+3x+9
7x+2=14+3x______/-3x
4x+2=14___________/-2
4x=12___/:4
x=3
d) -5x+12+x=2x-12
-4x+12=2x-12__________/-2x
-6x+12=-12__________/-12
-6x=-24_________/:(-6)
x=4
2x+5x-x=2+4
6x=6/:6
x=1
b) -3+2x-6=2x-12
2x-2x=-12+3+6
0=-3
c) 7x+2=5+3x+9
7x-3x=5+9-2
4x=12/:4
x=3
d) -5x+12+x=2x-12
-5x+x-2x=-12-12
-6x=-24 /: (-6)
x=4