( 2x -280 +20 ) : 192 =0
<=>2x-280+20=0
<=>2x-280=-20
<=>2x=260
<=>x=130
( 2x - 280 + 20 ) : 192 = 0
=> 2x - 280 + 20 = 0
=> 2x - 280 = - 20
=> 2x = 260
=> x = 130
( 2x - 280 + 20 ) : 192 = 0
=> 2x - 280 + 20 = 0
=> 2x - 280 = - 20
=> 2x = 260
=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130
{ 2x -280 + 20 } : 192 = 0
<=> 2x -280 + 20 = 0
<=> 2x - 280 = -20
<=> 2x = 260
<=> x = 130