3.2-3.x]+ [5.x-5.6] =-98
( 6-3.x)+ ( 5.x -30 ) = -98
6- 3.x + 5.x - 30 = -98
(6-30)+ (5.x-3.x)= -98
-24 + 2.x = -98
2.x = -98 +24
2.x = -74
x = -74 : 2
x = -37
Duyệt đi !!~
C1: 3.(2 -x )+ 5. ( x-6 ) = -98
=> 3.2-3.x + 5.x-5.6 =-98
=> 6- 3.x + 5.x- 30 =-98
=> 5 x-3 .x =-98 - 6 +30
=> x.2 =- 104 +30
=> x.2 = -74
=> x =-74:2
=> x = -37
C2 3.(2-x)+5.(x-6) =-98
=> 3.2 -3.x+ 5.x-5.6=-98
=>6 -3.x +5.x -30=98
=>(6-30) +[5.x-3.x] =-98
=> -24 + 2.x=-98
=> 2x =-98+24
=> 2x=-74
=> x=-74:2
x=-37
k mk nhé mk lm cả 2 cách cho bn đây