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2014-11-16T18:32:23+02:00
A)-3x+5=-9x-7
-3x+9x=-7-5
6x=-12
x=-12/2
x=-6
b) -4--4-(6-(-6+(-5-x)-7)-9)=1
-8-{6-[-6+(-5-x)-7]-9}=1
-8-{6-[-6-5-x-7]-9}=1
-8-{6-(-18-x)-9}=1
-8-(6+18+x-9)=1
-8-(15+x)=1
-8-15-x=1
-23-x=1
-x=1+23   (-1)
x=-24

2 5 2