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a fost răspuns

Rezolvati ecuatiile in R : a) 2(x+1) - 7(x-3)= 3(x+10) +1

Răspuns :

CotaSarah
(2x+2)-(7x-21)= 3x+30+1
2x+2= 3x+31 + 7x-21
2(x+1)= x(3+7)+ 31-21
2(x+1)= 10x+20 => impartim relatia prin 2
X+1=5x+10
5x-x=10-1
4x=9
X= 2,25

2x+2-7x+21=3x+30

2x-7x-3x=30-2-21

-8x=7

x=-7/8

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