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If a+b-c=d, if a-b+c=e, then a= ?
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If a+b-c=d, if a-b+c=e, then a= ?

User Ted Hopp
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a + b = d+c
a - b = e - c
The b and c cancel out.
2a = d+e
a = (d+e)/2

User Hasan Abdullah
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