RaquelB
RaquelB
10-12-2014
Mathematics
contestada
What's the property that justifies my 1st step?
Respuesta :
crisforp
crisforp
10-12-2014
Substraction is a comutative operation
x + 3x + 4 = 72
4x + 4 = 72
4x = 68
x = 68 / 4
x = 17.
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