Question

3{2(3x + 2) - 3[5(2x + 3) - 4(3x + 4)]} = 5[13 - 4( 2x + 9)] - 16


Răspuns : x = - 2

Answer 1

Deci
Eliminam parantezele
3(6x+4-3(10x+15-12x-16))=5(13-8x-36)-16
Reducem termenii asemenea
3(6x+4-3(-2x-1))=5(-23-8x)-16
3(6x+4+6x+3)=-115-40x-16
3(12x+7)=-131-40x
36x+21=-131-40x
36x+40x=-131-21
76x=-152
x=-2

Answer 2

3{2(3x + 2) - 3[5(2x + 3) - 4(3x + 4)]} = 5[13 - 4( 2x + 9)] - 16

3 [ 6 x + 4 - 3 ( 10 x + 15 - 12 x - 16 ) ] = 5 ( 13 - 8 x - 36 ) - 16

3 · [ 6 x + 4 - 3 ( - 2 x - 1 ) ] = 5 · ( - 8 x - 23 ) - 16

3 · ( 6 x + 4 + 6 x + 3 ) = - 40 x - 115 - 16

3 · ( 12 x + 7 ) = - 40 x - 131

36 x + 21 + 40 x = - 131

76 x = - 131 - 21

x = - 152 : 76

x = - 2