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100÷(-25) - 75x÷(-25) = 4x
-4 + 3x = 4x
-4 = 4x - 3x
x = -4
Comprobacion :
(100-75x)÷(-25)=4x
{100-75(-4) }÷(-25)=4 (-4)
(100 + 300)÷(-25)= -16
400 ÷(-25) = -16
-16 = -16