RaquelB RaquelB

10-12-2014
Mathematics

contestada

What's the property that justifies my 1st step?

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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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