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Assuming the simplest case of two equations in two variable: solve one of the equations for one of the variables. Substitute the value found for the variable in all places in which the variable appears in the second equation. Solve the resulting equation. This will give you the value of one of the variables. Finally, replace this value in one of the original equations, and solve, to find the other variable.
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Why did the Germans invade Russia?
Because Adolph Hitler was a Doi-doi-doi.
What is bigger a zebra or a chimp?
An elephant. Doi doi
Why are groups form?
Because they felt like it. DOI DOI
When was Tōru Doi born?
Tōru Doi was born in 1958.
What is Choeng Doi's population?
The population of Choeng Doi is 10,750.
When was Hiroaki Doi born?
Hiroaki Doi was born in 1978.
When did Michiyoshi Doi die?
Michiyoshi Doi died in 1975.
When did Takeo Doi die?
Takeo Doi died in 2009.
When was Masaki Doi born?
Masaki Doi was born in 1960.
When was Ryuichi Doi born?
Ryuichi Doi was born in 1939.
When was Toshiyuki Doi born?
Toshiyuki Doi was born in 1978.
When did Doi - retailer - end?
Doi - retailer - ended in 2003.
