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rezolvati-mi va rog ecuatiile
a)4[5(x-2)-39(x-4)]+5x-11=6(x+2)-1
b)7x-3[7(x+3)-5(x+4)=5(x+1)
c)2*[6(x+3)-3(x=5)]-4x=6(x+4)
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Răspuns :

a) 4(5x-10-39x+156)+5x-11=6x+12-1
4(-34x+146)+5x-6x=11+12-1
-136x+584-x=22
-137x=22-584
-137x=-562   inmulti -1
137x=562
x=562/137
x=4,(10218978)

b) 7x-3(7x+21-5x-20)=5x+5
7x-3(2x+1)=5x+5
7x-6x-3=5x+5
7x-6x-5x=5+3
-4x=8
-x=8/4
-x=2     inmultim -1
x=-2

c) 2(6x+18-3x+15)-4x=6x+24
2(3x+33)-4x-6x=24
6x+66-10x=24
-4x=24-66
-4x=-42   inmultim -1
4x=42
x=42/4
x=10,5

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