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How do I do substitution?

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Ok.. so far to figure it out I subtracted 3 and subtracted it from the 12... and got
x+2(5-x)=9

Is that correct so far?

no

..Ok. Let me try something else.

Ok so u distribute the 2 with whats in the parenthesis first?

BODMAS? I only know of PEMDAS?

ok use that then, im in Aus, so they teach it differently down here, sorry ;)

all good, always welcome

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