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If the question was a+8-4=16 what is a? you have to work backwards and change the plus to minus and minus to plus... 16+4-8=a, a=12

If the algebra question was a little bit more complicated like 2n+6= 20, that is the same as 2xn+6=20. Like before, we have to work backwards so (20-6):2=n, n=7

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12y ago

What else can I help you with?