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Bellamaryuka
a fost răspuns

Rezolvati ecuatiile b)2(x-3)-13=x-21 c)3(2x+1)-10=2(x-3)+11 d)3(4x-)-5x=3x+7

Răspuns :

Smaralda
b)2(x-3)-13=x-21
2x+6−13=x−21
2x−7=x−21
2x−7−x=−21
x−7=−21
x=−21+7
x=-14
c)3(2x+1)-10=2(x-3)+11
6x+3−10=2x−6+11
6x−7=2x−6+11
6x−7=2x+5
6x=2x+5+7
6x=2x+12
6x−2x=12
4x=12
x=12/4
x=3
d)3(4x-)-5x=3x+7
12 x−5x=3x+7
3×4x−5x=3x+7
7x=3x+7
7x−3x=7
4x=7
x=7/4

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