2x + 2y - x - (8 + 1)?
2 answers:
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This is the simplest proportion i have seen.
This is how we do it:
= 
The answer surprisingly is obvious, z = 1
But we can still do cross multiplication
7z = 7
Divide by 7 to isolate z
7 and 7 cancels out
z = 1
This is how we do it:
The answer surprisingly is obvious, z = 1
But we can still do cross multiplication
7z = 7
Divide by 7 to isolate z
7 and 7 cancels out
z = 1