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seropon [69]
4 years ago
6

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

Mathematics
1 answer:
rusak2 [61]4 years ago
8 0
Substraction is a comutative operation 
x + 3x + 4 = 72
4x + 4 = 72
4x = 68
x = 68 / 4
x = 17.
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