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2x+4*(435-x)=1040
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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