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Rezolvati urmatoarele ecuatii:
b) 2(3x+4)-5(2x-3)+7=7(x-1)+4
c) 2(3x-4)+5(6x-7)-7x=16(x+15)-10


Răspuns :

A)2(3x+4)-5(2x-3)+7=7(x-1)+4 6x+8-10x+15+7=7x-7+4 6x-10x-7x=4-7-7-15-8 -11x=-33 X=-33/-11 x=3
2(3x+4)-5(2x-3)+7=7(x-1)+4
6x+8-10x+22=7x-3
11x+33=0
x=3
2(3x-4)+5(6x-7)-7x=16(x+15)-10
6x-8+30x-35-7x=16x+240-10
36x-23x-273=0
13x-273=0
x=273/13
x=21