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3(x+5)-6(x-2)=4(x+2)-5(x-4)

3x56x24x25x4 class=

Răspuns :

3(x+5)-6(x-2)=4(x+2)-5(x-4)
(3x+15)-(6x-12)=(4x+8)-(5x-20)
3x+15-6x+12=4x+8-5x+20
3x-6x-4x+5x=8+20-15-12
-2x=1 |×(-1)
2x=-1
x=-1/2
3x+15-6x+12=4x+8-5x+20
-3x+15= -x= 28
-3x+x= 28-15
2x= 13
x= 13\2 ; x= 6,5