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2{7x-3[3(x+1)-2(x+4)]-9}=5(x+3)

Răspuns :

2{7x-3[3(x+1)-2(x+4)]-9}=5(x+3)

2[7x-3(3x+3-2x+8)-9]=5x+15

2(7x-3x+33-9)=5x+15

2(4x+24)=5x+15

8x+48=5x+15

3x=33

x=33:3

x=11





2{7x-3[3(x+1)-2(x+4)]-9}=5(x+3)
2[7x-3(3x+3-2x-8)-9]=5x+15
2[7x-3(x-5)-9]=5x+15
2(7x-3x+15-9)=5x+15
2(4x+6)=5x+15
8x+12=5x+15
8x-5x=15-12
3x=3
x=1