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Ariea5678910
a fost răspuns

-5(x-7)=30-(2x+1)
-2 (x+5) + 3=2-3 (X+1)
3(2x-1)+6x =10x-7
4n-2(n+7)=2n-2(n-1)

Răspuns :

Teodoraalbei
-5x+35=30-2x-1
-5x+2x=30-1-35
-3x=-6
x=2

-2x-10+3=2-3x-3
-2x+3x=2-3+10
x=9

6x-3+6x=10x-7
6x+6x-10x=-7+3
2x=-4
x=-2

4n-2n-14=2n-2n+2
2n=2+14
2n=16
n=8