Răspuns :
2x+4·(435-x)=1040 <=> 2x + 1740 - 4x = 1040 <=>
2x - 4x = 1040 - 1740 <=> -2x = -700 => x = (-700):(-2) = > x = 350
2x+4·435-4x = 1040
2x+1740-4x = 1040
2x-4x = 1040 - 1740
-2x = -700
x = -700 : (-2)
x = + 350
2x+4·(435-x)=1040 <=> 2x + 1740 - 4x = 1040 <=>
2x - 4x = 1040 - 1740 <=> -2x = -700 => x = (-700):(-2) = > x = 350
2x+4·435-4x = 1040
2x+1740-4x = 1040
2x-4x = 1040 - 1740
-2x = -700
x = -700 : (-2)
x = + 350