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c)-6,3-2,2=-8,5
d)2,6+(-10)=2,6-10=-7,4
e)-0,2-(-0,7)=-0,2+0,7=0,5
zad.Rozwiąż równanie.
a)2(x+3)=10
2x+6=10
2x=10-6
2x=4 /:2
x=2
b)3(x-1)+2=8
3x-3+2=8
3x=8+3-2
3x=9 /:3
x=3
c)2(13-x)-9=-7
26-2x-9=-7
-2x=-7-26+9
-2x=-24 /:(-2)
x=12
d)3(1-x)+2=-7
3-3x+2=-7
-3x=-7-3-2
-3x=-12 /:(-3)
x=4
e)3(x+3)=2(x+4)+x+1
3x+9=2x+8+x+1
3x-2x-x=8+1-9
0=0