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RaquelB
RaquelB RaquelB
  • 10-12-2014
  • Mathematics
Answered

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

Verified Answer :

crisforp
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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